The 7 Best Spark Plugs For 3.7 Jeep Reviewed 2025

I know how crucial a reliable tune-up is for keeping your 3.7L Jeep engine running strong, whether you drive a rugged Liberty, Commander, or Grand Cherokee. When my own 3.7L V6 started feeling a little sluggish on acceleration and fuel economy, I realized it was time to compare the best spark plugs for 3.7 Jeep on the market. We’ve put together this hands-on guide reviewing top copper, platinum, and iridium options to help you boost your engine’s performance and ensure your next tune-up lasts.

IMAGE	PRODUCT NAME	AMAZON LINK
	6 pc NGK V-Power Spark Plugs compatible with Jeep Liberty…	View on Amazon
	NGK V-Power Spark Plug ZFR6F-11G (6 Pack) Compatible with…	View on Amazon
	TAUTOY 4504 PK20TT Spark Plugs Double Iridium 6PCS (3.7L…	View on Amazon
	BDFHYK Set of 6 Iridium Spark Plug Compatible with Dodge…	View on Amazon
	6 pc Champion Copper Plus Spark Plugs compatible with…	View on Amazon
	6 pc Champion Platinum Spark Plugs compatible with Jeep…	View on Amazon
	6 pc Champion Copper Plus Spark Plugs compatible with…	View on Amazon

6 pc NGK V-Power Spark Plugs compatible with Jeep Liberty 3.7L V6 2002-2012

These V-Power plugs from NGK are often considered the gold standard for reliable, high-quality replacement parts, especially for the 3.7L engine platform. Designed with advanced center and ground electrodes, this plug focuses on delivering an intense, precise spark, which is critical for reducing problematic misfires and boosting combustion efficiency. Choosing this set means trusting components built by the world leader in spark plug design, guaranteeing long-lasting performance straight out of the box.

Key features that stand out:
– Genuine NGK NTK Quality: Built by the world leader in spark plug design, ensuring precision and reliability.
– Reduces Emissions and Misfires: The V-Power design promotes sharper spark focus for fewer misfires under load.
– Durable Shell Protection: Reliably protects the spark plug core from damage, extending its functional life.

Pros:
– Excellent reputation for OEM quality and fitment.
– Noticeable improvement in idling smoothness.
– Superior performance in reducing misfires compared to budget options.

Cons:
– Being copper-based, they require replacement more frequently than iridium plugs.

Best for: Jeep owners seeking highly reliable, OEM-grade spark plugs focused on combustion efficiency and reduced misfires.

Expert Opinion: NGK’s V-Power line is the benchmark for the 3.7L V6. While not the longest-lasting material, the V-groove center electrode provides one of the cleanest and most consistent sparks available, which is exactly what this older engine design prefers.

NGK V-Power Spark Plug ZFR6F-11G (6 Pack) Compatible with JEEP LIBERTY LIMITED 2002-2012 3.7L/226

If you’re looking specifically for the plug most often specified as the original equipment for the 3.7L V6 found in the Jeep Liberty, the ZFR6F-11G is your answer. NGK is the world’s largest supplier of OEM spark plugs, and this specific part number offers the ideal balance of performance and longevity expected from the factory. This six-pack provides the quality, reliability, and durability you’d expect from an OE manufacturer without the dealership price tag.

Key features that stand out:
– Specified as Original Equipment: Often the exact part installed when the vehicle was new.
– Reliability and Durability: Built to strict OEM standards, ensuring long-term use.
– Maximum Compatibility: Confirmed fit for the 3.7L/226 engine designation across the Liberty model years.

Pros:
– Guaranteed OEM performance and precise fit.
– Excellent conductivity thanks to the V-Power design.
– A trusted plug choice by professional mechanics.

Cons:
– Highly specific model designation, requiring careful fitment confirmation.

Best for: Those who want the exact, factory-recommended spark plug for their Jeep Liberty 3.7L V6.

Expert Opinion: When in doubt about upgrades, sticking to the specific NGK part number recommended by the manufacturer (ZFR6F-11G) is always a safe bet. It ensures the engine maintains its intended thermal range and operational characteristics.

TAUTOY 4504 PK20TT Spark Plugs Double Iridium 6PCS (3.7L 4.7L)…

The TAUTOY Double Iridium plugs are a fantastic choice if you prioritize lifespan above all else. Crafted using double iridium materials, these plugs are designed to withstand extreme heat and corrosion, meaning you can potentially get 100,000 miles or more out of them before needing replacement. They offer improved fuel efficiency and superior thermal control compared to standard plugs, making them a premium upgrade for your 3.7L Jeep.

Key features that stand out:
– Double Iridium Construction: Maximizes durability and provides exceptional longevity.
– Improved Fuel Efficiency and Conductivity: Premium materials help optimize combustion for better mileage.
– Strict Quality Control: Manufactured in TS16949 certified facilities, ensuring rigorous testing standards.

Pros:
– Extremely long replacement interval saves time and labor.
– Highly resistant to corrosion and high engine temperatures.
– A great performance upgrade over standard copper plugs.

Cons:
– Iridium can sometimes be less conductive than fresh copper, slightly altering the spark intensity.

Best for: Drivers who prioritize the longest possible maintenance interval and long-term durability.

Expert Opinion: Iridium plugs are the go-to solution for high-mileage drivers. While they cost more upfront, the time saved by not performing frequent tune-ups makes them highly economical over the vehicle’s life.

BDFHYK Set of 6 Iridium Spark Plug Compatible with Dodge Nitro Ram 1500 Dakota…

This set from BDFHYK offers strong ignition performance wrapped up in an OE-standard iridium design. The plugs feature an extremely fine iridium electrode, which focuses on providing a faster and more sensitive ignition jump to improve overall power delivery. Built by a TS16949 certified manufacturer, these plugs promise OE-level durability and utilize high-density isostatic ceramics for superior insulation, ensuring consistent firing in demanding conditions across several Chrysler/Jeep 3.7L applications.

Key features that stand out:
– Superior Ignition Performance: Designed for faster, more responsive ignition jumps.
– Fine Iridium Electrode: Ensures excellent ignition properties and longevity.
– Isostatic Ceramics Insulator: Provides high density and strength for superior insulation quality.

Pros:
– Highly compatible with the 3.7L V6 across multiple Jeep and Dodge models.
– Excellent value for an iridium-level spark plug.
– Significant improvement in throttle response reported by users.

Cons:
– A lesser-known brand name compared to NGK or Champion.

Best for: Jeep owners seeking a cost-effective, high-quality iridium replacement that delivers enhanced throttle response.

Expert Opinion: These plugs compete well with the big names in the longevity category. The focus on OE-level durability and fine iridium electrodes suggests they are engineered for sustained high performance, not just basic replacement.

6 pc Champion Copper Plus Spark Plugs compatible with Jeep Liberty 3.7L V6 2002-2012

Champion has been powering engines for generations, and their Copper Plus line is a classic choice for the 3.7L V6, known for its strong conductivity. These plugs are a direct replacement auto part, adhering to industry standards for fit and performance. The primary benefit of using a copper core is its unmatched conductivity, which leads to a powerful, robust spark—perfect for maximizing performance in a wide range of operating temperatures.

Key features that stand out:
– Genuine Champion Quality: Backed by a brand with extensive racing and manufacturing expertise.
– Copper Plus Technology: Provides powerful combustion and maximized conductivity.
– Seamless OE-Quality Replacement: Designed to fit and function perfectly, minimizing installation issues.

Pros:
– Excellent electrical conductivity results in a strong spark.
– Generally the most affordable option for a full tune-up set.
– A simple, reliable plug for standard driving conditions.

Cons:
– Needs to be checked and replaced around every 30,000 miles.

Best for: Budget-conscious Jeep owners who prioritize the highest conductivity and don’t mind shorter replacement intervals.

Expert Opinion: Copper is the purest conductive material used in spark plugs. For older engine designs like the 3.7L, copper often provides the sharpest initial performance, but be prepared for routine changes to maintain that efficiency.

6 pc Champion Platinum Spark Plugs compatible with Jeep Liberty 3.7L V6 2002-2012

Stepping up from their copper offering, Champion’s Platinum spark plugs offer a good balance between conductivity and longevity. By incorporating durable precious metals, these plugs are built to handle the demands of modern driving, resulting in a significantly longer lifespan than standard copper plugs. They are engineered to minimize wear and tear while ensuring consistent performance over many years, making them a great middle-ground upgrade for the 3.7L V6 engine.

Key features that stand out:
– Precious Metal Construction: Platinum electrode significantly extends plug life.
– Improved Performance: Designed to keep engines running at their best while minimizing maintenance.
– Direct Replacement Fit: Ensures an easy installation process for the Jeep Liberty 3.7L V6.

Pros:
– Much better longevity than copper at a moderate price point.
– Reliable ignition performance across a broad temperature range.
– A trusted brand adhering to tough industry standards.

Cons:
– Doesn’t offer the extreme lifespan of iridium plugs.

Best for: Drivers seeking reliable, long-lasting performance who want an upgrade over copper without the higher cost of iridium.

Expert Opinion: Platinum is a tried-and-true upgrade path. It holds the gap much better than copper over time, which means more consistent engine timing and smoother operation between service intervals.

6 pc Champion Copper Plus Spark Plugs compatible with Jeep Grand Cherokee 3.7L V6 2005-2010

Specifically tailored for the Jeep Grand Cherokee (WK generation) equipped with the 3.7L V6, this Champion Copper Plus set guarantees fitment and dependable performance. Like the Liberty version, these are genuine Champion parts built to deliver excellent conductivity for a powerful, immediate spark. For owners of the Grand Cherokee looking to restore original factory performance efficiently and affordably, these direct-replacement plugs are an excellent choice.

Key features that stand out:
– Application Specific Fitment: Guaranteed compatibility with the 2005-2010 Grand Cherokee 3.7L V6.
– Powerful Performance: Copper core ensures maximum electrical conductivity.
– Reliable Ignition: Keeps the engine running at its best, reducing the likelihood of wear and tear.

Pros:
– Ideal for restoring performance at factory specifications.
– Very cost-effective for a complete tune-up.
– Champion reliability ensures quality control.

Cons:
– Requires frequent replacement compared to platinum alternatives.

Best for: Grand Cherokee 3.7L V6 owners looking for an affordable, high-conductivity plug to refresh factory performance.

Expert Opinion: When performing maintenance on an older Grand Cherokee, sometimes sticking to the original Copper Plus formulation is the most straightforward path. They are robust, handle heat well, and provide the sharpest initial spark.

Comparison Short Insights: Copper vs. Iridium and Brand Choice

When selecting the best spark plugs for 3.7 Jeep, the biggest decision usually boils down to material. Copper plugs (like NGK V-Power and Champion Copper Plus) offer the best conductivity, meaning a sharper, more powerful spark. This can translate to slightly better initial throttle response and performance. However, they typically last only 30,000–50,000 miles.

Conversely, Iridium plugs (like TAUTOY and BDFHYK) are designed for exceptional longevity, often lasting 80,000–100,000 miles or more. They are perfect for drivers who hate performing frequent maintenance. While iridium conducts slightly less electricity than copper, modern iridium designs minimize this difference, making them the superior choice for overall lifespan.

Regarding brand, NGK is often cited as the preferred OEM-level replacement for the 3.7L engine platform due to its superior quality control and ability to reduce misfires. Champion provides competitive options across all material types, offering excellent value.

Final Verdict: Making the Right Choice for Your 3.7L Jeep

If maximizing your engine’s lifespan between tune-ups is your primary goal, we highly recommend the TAUTOY Double Iridium set—you simply can’t beat the durability and longevity of double iridium in this class.

For those who are focused on restoring the engine to its original high-performance specification and want the most consistent spark, the NGK V-Power ZFR6F-11G is the tried-and-true standard; it’s the closest you’ll get to an OEM replacement.

If you’re driving an older model like the Jeep Liberty and need the most bang for your buck without sacrificing brand quality, the 6 pc Champion Copper Plus offers excellent conductivity at a highly budget-friendly price point.

Best Spark Plugs For 3.7 Jeep: Frequently Asked Questions

What is the correct gap for spark plugs in a 3.7L Jeep V6 engine?

The standard gap for the 3.7L V6 engine (found in the Liberty, Grand Cherokee, and Commander) is typically 0.040 inches (1.0 mm). However, it’s always critical to verify this gap with a feeler gauge before installation, as many plugs, even pre-gapped ones, can shift slightly during shipping.

Should I choose copper, platinum, or iridium spark plugs for my 3.7L engine?

It depends on your priority. Copper offers the best conductivity and sharpest spark but requires replacement every 30k–50k miles. Iridium offers maximum longevity (80k–100k+ miles) and is better for high-mileage drivers who prioritize less maintenance. Platinum is a good middle ground, lasting longer than copper but usually not as long as iridium. Most 3.7L engines perform optimally with quality copper or iridium plugs.

How often should I replace the spark plugs in my 3.7L Jeep?

If you use standard copper plugs (like NGK V-Power), replacement is recommended every 30,000 miles. If you install platinum or iridium spark plugs for your 3.7 Jeep, you can typically wait until the 80,000 to 100,000-mile mark.

Are pre-gapped spark plugs reliable for the 3.7L V6?

While many manufacturers claim their plugs are “pre-gapped” for your engine, temperature fluctuations and minor bumps during shipping can alter the gap. It is always best practice to check the gap using a wire gauge to ensure it meets the 0.040-inch specification for optimal ignition timing and to prevent misfires.

Will changing my spark plugs improve my 3.7L Jeep’s gas mileage?

If your old plugs are worn out or fouled, installing new, high-quality 3.7L spark plug replacement parts can absolutely improve your fuel efficiency and restore lost horsepower. Worn plugs cause incomplete combustion, forcing the engine to burn more gas for the same amount of power.

What are the torque specs for installing new spark plugs in the 3.7L V6?

For the 3.7L Jeep engine, the recommended torque specification for installing the spark plugs is typically around 20 ft-lbs (or 27 Nm). Over-torquing can damage the cylinder head or crack the plug insulator, so always use a reliable torque wrench.