Table of Contents
Ever wondered what keeps your engine humming smoothly while you cruise down the highway? It’s not just the fuel or the air intake—it’s the tiny but mighty spark plug, often overlooked until something goes wrong. These unsung heroes sit deep within your engine, enduring extreme heat and pressure thousands of times per minute, igniting the air-fuel mixture that powers your journey. Yet, most drivers only think about them when misfires, rough idling, or that dreaded “check engine” light appear. Understanding spark plugs isn’t just for gearheads; it’s essential knowledge for anyone who wants reliable performance, optimal fuel economy, and a longer engine life.
Automotive technicians deal with spark plug issues daily, and their insights reveal a critical truth: choosing the wrong plug isn’t just an inconvenience—it can cause serious engine damage. While flashy marketing might push certain “premium” options, pros focus on precision engineering tailored to your specific vehicle. The reality is, there’s no universal “best” spark plug. Instead, technicians emphasize matching the plug’s design, materials, and specifications to your engine’s unique demands. In this guide, we’ll unpack exactly what matters most when selecting spark plugs, based on real-world expertise—not hype—so you can make informed decisions that keep your ride running flawlessly.
Top 10 Spark Plugs
Detailed Product Reviews
1. ACDelco 41-962 Professional Platinum Spark Plug, (8)
Overview:
This 8-pack of ACDelco Professional Platinum spark plugs delivers reliable ignition for GM vehicles, engineered as a direct replacement for original equipment. Featuring a robust construction focused on longevity and consistent performance in everyday driving conditions.
What Makes It Stand Out:
Its one-piece fired-in suppressor seal—blending three glass types—creates a gas-tight barrier against compression pressures and radio interference. The double platinum electrodes ensure stable voltage demands, while the pure copper core maintains cooler operating temperatures, significantly reducing fouling and extending plug life beyond standard copper alternatives.
Value for Money:
Priced competitively for an 8-pack, it offers exceptional value for GM owners seeking OEM-equivalent durability without iridium’s premium cost. It outperforms basic copper plugs in longevity and beats many aftermarket platinums in thermal management, making it ideal for routine maintenance.
Strengths and Weaknesses:
Strengths: Excellent heat dissipation via copper core; reduced radio interference; strong resistance to fouling; seamless GM compatibility. Weaknesses: Less extreme longevity than iridium options; not optimized for high-performance tuning; limited heat range versatility compared to premium iridium plugs.
Bottom Line:
A dependable, cost-effective choice for GM sedan and truck owners prioritizing trouble-free daily driving and extended service intervals. Highly recommended for standard engine replacements where maximum performance isn’t critical.
2. NGK 6619 Iridium Spark Plugs LFR6AIX-11-6 Pack
Overview:
NGK’s 6-pack LFR6AIX iridium plugs target vehicles demanding precision ignition, leveraging aerospace-grade materials for enhanced efficiency and reliability across diverse driving conditions.
What Makes It Stand Out:
The ultra-fine 0.6mm iridium center electrode enables superior ignitability and throttle response, while NGK’s patented triple gasket sealing process guarantees zero combustion gas leakage. Its wide heat range combats carbon buildup and pre-ignition far more effectively than conventional platinum or copper plugs.
Value for Money:
Though pricier than basic plugs, the 6-pack offers strong value for performance-focused drivers. The iridium core ensures 25-40% longer lifespan than platinum equivalents, reducing long-term replacement costs. It’s a smart investment for modern engines where misfires impact fuel economy.
Strengths and Weaknesses:
Strengths: Exceptional anti-fouling; broad heat range adaptability; reliable sealing; smoother idle and quicker starts. Weaknesses: Higher upfront cost; overkill for very low-mileage vintage cars; requires precise gap verification during installation.
Bottom Line:
An outstanding upgrade for drivers seeking optimal fuel efficiency, responsiveness, and durability. Ideal for daily-driven modern vehicles—just confirm exact fitment for your engine.
3. GSPSCN Set of 4 Ignition Coil Pack UF652 and Iridium Spark Plug Compatible with 2012-2019 Hyundai Accent Veloster丨Kia Soul Rio 1.6L 14,Replaces# C1803，5C1860，273012B100，GN10634
Overview:
This integrated kit pairs 4 iridium spark plugs with matching ignition coils, engineered exclusively for 1.6L Hyundai and Kia models (2012-2019) to resolve common misfire issues like rough idling and check-engine lights.
What Makes It Stand Out:
The system promises a 100% spark energy boost via pure copper-wound coils and iridium plugs with triple-electrode durability. Key innovations include RF interference shielding, corrosion-resistant epoxy resins, and ultra-fast 0.1s ignition—restoring factory performance while cutting emissions.
Value for Money:
At a bundled price, it’s highly economical compared to buying OEM coils and plugs separately. Solving persistent misfires improves fuel economy by 5-8%, offsetting costs quickly. However, its narrow vehicle compatibility limits resale value.
Strengths and Weaknesses:
Strengths: Fixes misfires and rough idling; 3x plug longevity; easy OEM replacement; immediate fuel economy gains. Weaknesses: Vehicle-specific (only fits listed Hyundais/Kias); coil quality lags behind Bosch/OEM; no warranty details provided.
Bottom Line:
A practical, budget-friendly solution for Accent/Veloster/Soul/Rio owners battling ignition woes. Prioritize this if your OEM coils are failing—but verify part numbers match your VIN.
4. NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack
Overview:
NGK’s Iridium IX 4-pack caters to performance enthusiasts, delivering race-proven ignition technology for high-compression and turbocharged engines seeking maximum throttle response and combustion efficiency.
What Makes It Stand Out:
The 0.6mm laser-welded iridium tip ensures extreme ignitability, while the tapered ground electrode minimizes electrical quenching. Features like a long insulator nose (anti-fouling), corrugated ribs (flashover prevention), and triple-seal construction make it ideal for aggressive driving and forced induction.
Value for Money:
Priced premium but justified for performance applications. Outperforms standard iridium plugs in heat resistance and longevity (up to 120k miles), reducing long-term costs for modified or high-stress engines where reliability is critical.
Strengths and Weaknesses:
Strengths: Unmatched throttle response; superior anti-fouling; excellent heat tolerance; robust trivalent plating. Weaknesses: Over-engineered for stock daily drivers; requires precise gap checking; expensive for casual users.
Bottom Line:
A top-tier choice for tuners and performance drivers needing maximum power and consistency. Avoid for basic commuter cars—but essential for track-ready or modified builds.
5. NGK 3951 Spark Plugs TR55 (8 Pack)
Overview:
This 8-pack of NGK TR55 copper-core plugs serves as a reliable, cost-effective solution for older vehicles and budget-conscious drivers seeking dependable OEM-equivalent performance without advanced metallurgy.
What Makes It Stand Out:
NGK’s copper core design ensures optimal heat conduction for consistent spark in moderate-temperature engines. Built to stringent OEM standards, it’s a trusted factory fitment for many legacy Japanese and European models, prioritizing simplicity and accessibility.
Value for Money:
The lowest-cost option here, ideal for high-mileage older cars where frequent plug changes are expected. While lifespan is shorter (20k-30k miles) than platinum or iridium, the minimal price per plug makes long-term maintenance affordable.
Strengths and Weaknesses:
Strengths: Excellent conductivity for smooth cold starts; widely compatible with older engines; budget-friendly; easy installation. Weaknesses: Shorter service life; prone to fouling in stop-and-go traffic; not suitable for modern direct-injection engines.
Bottom Line:
Perfect for maintaining vintage or high-mileage vehicles economically. Choose this for dependable, no-frills operation—but verify fitment carefully, as it’s unsuited for newer performance engines.
6. NGK # 3186 G-Power Platinum Spark Plugs TR5GP - 8 PCSNEW
Overview:
The NGK G-Power Platinum TR5GP set delivers reliable ignition for engines requiring platinum plugs. Designed as an upgrade over standard copper plugs, these eight-pack units target drivers seeking improved longevity and consistent performance without the premium price of iridium.
What Makes It Stand Out:
Its patented triple gasket sealing process prevents combustion gas leakage—a critical reliability feature often overlooked in budget plugs. The platinum center electrode resists carbon buildup and pre-ignition far better than copper alternatives, while the wide heat range ensures stable operation under varying loads, making it versatile for daily drivers.
Value for Money:
Priced moderately above basic copper plugs but below iridium options, this set offers exceptional longevity for its cost. It outperforms entry-level plugs in durability (reducing long-term replacement frequency) and matches OEM specifications for many vehicles, justifying its mid-tier price point for budget-conscious owners prioritizing reliability.
Strengths and Weaknesses:
Strengths: Excellent carbon resistance; robust sealing eliminates gas leaks; wider heat range enhances adaptability; OEM-quality construction.
Weaknesses: Shorter lifespan than iridium plugs; not ideal for high-performance or turbocharged engines; limited efficiency gains compared to finer-wire iridium designs.
Bottom Line:
A dependable, cost-effective platinum plug ideal for standard gasoline engines. Choose it for reliable daily driving and easy maintenance, but opt for iridium if maximizing fuel economy or longevity is critical.
7. GSPSCN Set of 4 Ignition Coil Pack UF582 and Iridium Spark Plug Compatible with 2006 2007 2008 2009 2010 2011 Honda Civic 1.8L L4,Replaces# 5C1637，C1580，GN10324，30520RNAA01
Overview:
This GSPSCN kit combines four ignition coils and iridium spark plugs specifically engineered for 2006–2011 Honda Civic 1.8L engines. It targets owners battling misfires, rough idling, or check engine lights with a comprehensive ignition system solution.
What Makes It Stand Out:
The integrated approach—pairing high-output coils (60–100 mJ energy) with fine-wire iridium plugs (0.6mm tip)—delivers stronger sparks for complete combustion. The coils feature RF interference shielding and extreme-temperature resilience (–40°C to 150°C), while iridium electrodes promise triple the lifespan of standard plugs, directly tackling common Civic issues like poor fuel economy.
Value for Money:
Competitively priced against buying OEM coils and plugs separately, this kit provides a significant performance uplift. The iridium plugs’ longevity and coil durability justify the investment, especially for high-mileage Civics where misfires are prevalent—potentially avoiding costly dealership diagnostics.
Strengths and Weaknesses:
Strengths: Solves misfires/rough idle effectively; iridium plugs enhance fuel efficiency; coils offer superior heat/corrosion resistance; extensive compatibility list simplifies fitment.
Weaknesses: Limited to specific Honda models; non-NGK plugs may not match OEM iridium longevity; coil quality slightly lags premium brands like Denso.
Bottom Line:
An excellent value-oriented fix for aging Honda Civics. Highly recommended for resolving ignition-related issues, though verify exact part numbers for your VIN to ensure seamless installation.
8. NGK ILZKAR8J8SY Laser Iridium Spark Plug (95660 Laser Iridium), 4 Pack
Overview:
NGK’s Laser Iridium plug (ILZKAR8J8SY) represents the pinnacle of OEM-spec ignition technology. As original equipment on many modern vehicles, this four-pack prioritizes precision engineering for optimal combustion efficiency and extended service life.
What Makes It Stand Out:
The ultra-fine 0.6mm laser-welded iridium center electrode ensures exceptional ignition stability and fuel atomization. NGK’s OEM pedigree guarantees meticulous calibration for specific engines, while the V-grooved ground electrode optimizes spark exposure—critical for maximizing horsepower and reducing emissions in performance-tuned or fuel-efficient powertrains.
Value for Money:
Though pricier than platinum or copper plugs, its industry-leading longevity (up to 100,000 miles) and performance benefits deliver strong ROI. As the world’s largest OEM plug supplier, NGK’s quality control minimizes failure risk, making it a cost-saver versus frequent replacements of cheaper alternatives.
Strengths and Weaknesses:
Strengths: Unmatched durability; superior fuel economy and throttle response; OEM reliability; precise fitment for designated vehicles.
Weaknesses: Premium cost; overkill for low-compression engines; strict vehicle-specific fitment requires research.
Bottom Line:
The definitive choice for drivers seeking OEM-grade performance and longevity. Invest in this set if your vehicle’s manufacturer specifies Laser Iridium plugs—skip it only for basic commuter cars needing simpler solutions.
9. NGK 3951 Spark Plugs TR55 (6 Pack)
Overview:
NGK’s TR55 spark plugs offer a robust, budget-friendly solution for older or standard-compression engines. This six-pack emphasizes core reliability with decades of OEM-proven design, targeting everyday drivers prioritizing simplicity and value.
What Makes It Stand Out:
Its triple gasket sealing system prevents combustion leaks—a standout durability feature even among premium plugs. The extended heat range accommodates diverse driving conditions, while the copper core ensures strong conductivity. As an OE staple, it delivers consistent spark without complex tech, ideal for vintage or economy vehicles.
Value for Money:
Exceptionally affordable while maintaining NGK’s OEM quality. Significantly cheaper than iridium/platinum options yet outlasting generic copper plugs, it’s perfect for high-mileage fleets or budget rebuilds where cutting-edge efficiency isn’t critical.
Strengths and Weaknesses:
Strengths: Reliable triple-seal construction; wide heat range versatility; low cost; easy installation.
Weaknesses: Shorter lifespan than precious-metal plugs; minimal fuel economy gains; prone to carbon buildup in stop-and-go traffic.
Bottom Line:
A no-frills workhorse plug for non-demanding applications. Choose it for cost-effective replacements in older vehicles, but upgrade to iridium for modern engines seeking efficiency.
10. Iridium Platinum Spark Plugs 4 Pack 91970 ILNAR8B7G Compatible with Chevrolet Chevy Cruze Equinox Malibu Trax & Buick Encore Cascada & GMC Terrain 2016 2017 2018 2019 2020 L4 1.4 1.5 Bujías
Overview:
This four-pack of iridium-platinum plugs (91970 ILNAR8B7G) targets GM’s 1.4L/1.5L turbocharged engines across Chevy, Buick, and GMC models from 2016–2024. It promises enhanced efficiency and reliability for common daily drivers plagued by modern engine quirks.
What Makes It Stand Out:
The 0.6mm iridium center wire maximizes fuel atomization for better mileage, while the platinum-ground electrode balances cost and longevity. Rigorous QC addresses turbo-specific issues like misfires and rough idling—critical for GM’s sensitive direct-injection systems. The 12-month warranty adds peace of mind.
Value for Money:
Priced below OEM iridium plugs (e.g., AC Delco), it offers near-OEM performance at a discount. The focus on resolving common GM ailments (CEL lights, poor fuel economy) makes it a smart value, though long-term durability may trail NGK/Denso equivalents.
Strengths and Weaknesses:
Strengths: Noticeable fuel efficiency gains; solves turbo misfire issues; extensive GM fitment coverage; strong warranty.
Weaknesses: Brand lacks NGK’s OEM reputation; potential fitment confusion with similar part numbers; unproven longevity beyond warranty.
Bottom Line:
A compelling budget-friendly upgrade for GM owners battling efficiency or misfires. Verify your VIN-specific part number, but it’s a low-risk, high-reward choice for restoring smooth operation.
Understanding Spark Plug Fundamentals
What Spark Plugs Actually Do
At its core, a spark plug’s job seems simple: create a spark to ignite the compressed air-fuel mixture in the combustion chamber. But this process happens under brutal conditions—temperatures exceeding 1,400°F and pressures up to 1,000 psi. The plug must consistently deliver a precise spark at the exact millisecond required by the engine’s timing system. Failures here don’t just cause poor performance; they can lead to unburned fuel damaging catalytic converters or even piston erosion. Technicians stress that reliability isn’t optional—it’s foundational to engine health.
Key Components and Their Roles
Every spark plug consists of several critical parts working in harmony. The center electrode conducts high-voltage current from the ignition coil. The ground electrode completes the circuit, creating the spark gap where ignition occurs. The ceramic insulator prevents electrical leakage, while the metal shell threads securely into the cylinder head, dissipating heat. Technicians note that weaknesses in any single component—like a cracked insulator or corroded shell—can compromise the entire system, making material quality non-negotiable.
How Ignition Systems Influence Plug Choice
Modern ignition systems vary widely, from traditional distributor-based setups to coil-on-plug (COP) and direct ignition systems. Each delivers voltage differently, affecting spark plug requirements. High-energy ignition systems, common in performance or turbocharged engines, demand plugs engineered to handle stronger sparks without electrode erosion. Technicians always check the ignition system type first; using a plug designed for a low-energy system in a high-output engine leads to premature failure and erratic combustion.
Critical Features to Evaluate
Heat Range: Why It’s Non-Negotiable
Heat range determines how quickly a plug transfers combustion heat from the tip to the cylinder head. Too “cold,” and deposits build up, causing misfires. Too “hot,” and you risk pre-ignition or melted electrodes. Technicians emphasize that heat range must align with your engine’s operating conditions—factors like compression ratio, fuel type, and driving habits (e.g., frequent short trips vs. highway cruising). Ignoring this specification is a top reason for avoidable plug failures.
Electrode Material Science Explained
The electrode material directly impacts longevity and performance. Copper-core plugs offer excellent conductivity but wear faster, making them suitable for older engines. Precious metals like platinum or iridium feature finer-wire electrodes that resist erosion, enabling tighter spark gaps and consistent ignition over extended intervals. Technicians highlight that while precious metal plugs cost more upfront, their durability often makes them cost-effective for modern, computer-controlled engines requiring precise spark timing.
Spark Gap Precision and Consistency
The gap between the center and ground electrodes must be exact—typically between 0.028 to 0.060 inches, depending on the engine. Too wide, and the spark can’t jump reliably; too narrow, and the spark lacks energy for complete combustion. New plugs come pre-gapped, but technicians warn against assuming accuracy. Always verify with a gap tool, as mishandling during shipping can alter it. Incorrect gaps are a leading cause of hesitation and poor fuel economy.
Thread Design and Seat Sealing
Thread pitch, diameter, and reach must perfectly match your engine’s cylinder head. A plug that’s too long can collide with pistons; one that’s too short won’t seal properly, causing compression leaks. The seat design (tapered or washer-seated) is equally crucial for maintaining cylinder pressure. Technicians see frequent damage from DIYers forcing mismatched plugs, leading to stripped threads or blown head gaskets—a costly repair avoided by checking specifications meticulously.
Matching Plugs to Your Driving Reality
Engine Type and Age Considerations
Older engines with lower-compression ratios often perform better with copper or standard platinum plugs, which provide robust spark energy. Newer, high-compression, or turbocharged engines typically require fine-wire iridium plugs for their resistance to fouling and ability to support lean-burn strategies. Technicians caution that retrofitting modern plugs into vintage engines can cause issues due to incompatible heat ranges or voltage demands—always prioritize OEM compatibility.
Driving Conditions That Dictate Choice
Your typical driving environment heavily influences plug needs. Stop-and-go city driving increases carbon buildup, favoring plugs with anti-fouling designs. Frequent towing or high-RPM operation generates extreme heat, requiring colder heat ranges. Cold climates risk moisture-related misfires, so plugs with superior sealing and quick warm-up characteristics are essential. Technicians advise discussing your actual usage—not just your vehicle model—with a parts specialist.
Fuel Type Compatibility Essentials
Using the wrong plug with alternative fuels like E85 ethanol blends or compressed natural gas (CNG) accelerates electrode wear due to higher combustion temperatures. Ethanol’s cooling effect also demands a slightly hotter heat range to prevent fouling. Technicians stress that “universal” plugs rarely exist for alternative fuels—always consult your vehicle manufacturer’s recommendations for non-gasoline applications to avoid shortened plug life.
Avoiding Costly Installation Mistakes
Torque Specifications: Why Guessing Is Dangerous
Overtightening cracks the ceramic insulator; undertightening causes poor heat transfer and potential blowouts. Technicians use inch-pound torque wrenches religiously—values typically range from 7 to 25 ft-lbs depending on thread size and seat type. Guessing “snug” is a top cause of warranty claims they see. Always reference your service manual; aluminum heads require lower torque than cast iron to prevent thread damage.
Anti-Seize Compound: Use It Correctly
Applying anti-seize to the threads seems logical, but it alters friction, leading to over-torquing if not accounted for. Technicians either omit it entirely (relying on dry installation per OEM specs) or reduce torque by 20-25% if using it. Never apply anti-seize near the seat or electrodes—it can contaminate the combustion chamber. A tiny dab on threads only is sufficient when required.
Handling Pre-Gapped Plugs with Care
Modern plugs arrive with laser-precise gaps, but dropping them or mishandling can bend electrodes. Technicians avoid adjusting precious metal plugs whenever possible—bending fine iridium wires weakens them. If adjustment is unavoidable, use a dedicated gap tool that slides between electrodes without leverage; never hammer the ground electrode. Always double-check gaps before installation.
Dielectric Grease: Preventing Secondary Issues
Applying dielectric grease inside the spark plug boot isn’t just about easy removal—it prevents voltage leaks and moisture ingress that cause misfires. Technicians apply a thin film to the ceramic insulator (not the electrodes) to ensure the spark travels only across the gap. Skipping this step invites corrosion and erratic performance, especially in humid climates.
Recognizing When Replacement Is Urgent
Subtle Performance Degradation Signs
Beyond obvious misfires, technicians watch for less noticeable symptoms: a slight drop in fuel economy (2-3 MPG), delayed throttle response during acceleration, or a faint “popping” sound from the exhaust under load. These indicate weak sparks failing to fully ignite the mixture. Ignoring them forces the engine control unit to compensate, potentially causing long-term sensor or catalytic converter strain.
Diagnostic Trouble Codes Linked to Plugs
While P0300 (random misfire) is common, technicians note that codes like P0301-P0308 (specific cylinder misfires) or P0351-P0358 (ignition coil circuit faults) often trace back to worn plugs. Fouled or gapped plugs increase the voltage demand, overloading coils. Always inspect plugs when these codes appear—replacing coils alone without addressing the root plug issue leads to repeat failures.
Visual Inspection Clues Technicians Use
After removal, technicians examine plugs for telltale patterns:
- Wet, black soot: Rich fuel mixture or oil leakage.
- Chalky white deposits: Coolant intrusion or overly hot heat range.
- Melted electrodes: Severe pre-ignition requiring immediate attention.
- Eroded ground electrode: Normal wear, but excessive erosion suggests incorrect heat range or voltage issues.
This forensic analysis guides whether to adjust plug specs or investigate deeper engine problems.
Frequently Asked Questions
What’s the most common spark plug mistake drivers make?
Assuming all plugs for a vehicle year/make/model are identical. Critical specs like heat range or electrode design vary significantly between engine variants (e.g., V6 vs. turbocharged 4-cylinder), leading to poor performance if mismatched.
How often should I replace spark plugs?
Follow your vehicle manufacturer’s schedule—typically 30,000 to 120,000 miles—based on plug material and engine design. Never exceed these intervals, as worn plugs increase strain on ignition coils and sensors.
Can I clean old spark plugs instead of replacing them?
Technicians strongly advise against it. Cleaning can damage electrode coatings, alter gaps, and fail to address internal wear. New plugs are a cost-effective safeguard against ignition system damage.
Do expensive spark plugs really improve performance?
Only if they match your engine’s specific needs. Premium materials offer longevity and consistency but won’t “boost” power in a stock engine. Prioritize correct specifications over price tags.
Why do my new plugs keep fouling within weeks?
Fouling usually points to underlying issues like oil burning, a rich fuel mixture, or excessive idling—not the plugs themselves. Diagnose the root cause with a technician before replacing plugs again.
Are iridium plugs always better than platinum?
Not universally. Iridium’s finer wire suits high-precision ignition systems, but some engines perform optimally with platinum’s durability. Always defer to OEM specifications for your exact engine.
Can using the wrong heat range damage my engine?
Absolutely. A plug that’s too hot can cause pre-ignition (detonation), potentially destroying pistons. One that’s too cold leads to carbon buildup, misfires, and catalytic converter damage.
Should I replace ignition coils when changing spark plugs?
Not automatically. Coils should be tested for resistance and output. However, if plugs are severely worn, the extra strain may have compromised coils—technicians often check both as a preventive measure.
How do I know if my spark plugs are properly seated?
After torquing to spec, gently try to rotate the plug. It shouldn’t move. A poorly seated plug will cause compression leaks, evident as a hissing sound during startup or misfire codes.
Why do technicians avoid recommending specific brands?
Because compatibility depends entirely on your engine’s engineering specs, not brand reputation. A plug perfect for one vehicle could harm another—even within the same model year. Always prioritize OEM-equivalent specifications.
See Also
- 10 Top-Rated Motorcycle Spark Plugs According to Expert Mechanics in 2026
- 10 Top-Rated Platinum Spark Plugs According to Mechanics in 2026
- 10 Best Value Surface Discharge Spark Plugs for Small Engines in 2026
- 10 Most Durable Hot Plug Spark Plugs Based on Real User Reviews in 2026
- We Tested 50 Racing Spark Plugs - Here are the 10 Best for Performance Tuning