Best Spark Plugs For GMC Terrain: 7 Best Choices

I recently tackled a tune-up on my own GMC Terrain, and choosing the right plugs made a noticeable difference in throttle response and fuel economy. If you’re looking for the absolute best spark plugs for gmc terrain—whether you have the common 2.4L engine or a newer 1.5L or 2.0L model—you know the market can be confusing. I’ve broken down seven top-tier options, comparing everything from basic platinum reliability to high-performance iridium, so you can make an informed decision and get that smooth, reliable ride back.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK G-Power Platinum Spark Plug LTR5GP (4 Pack) for GMC…	View on Amazon
	4 pc NGK G-Power Spark Plugs compatible with GMC Terrain…	View on Amazon
	4 pc NGK Iridium IX Spark Plugs compatible with GMC…	View on Amazon
	4 pc NGK Iridium IX Spark Plugs compatible with GMC…	View on Amazon
	UF491 Ignition Coil Pack 12578224 and Iridium Spark Plugs…	View on Amazon
	Iridium Platinum Spark Plugs 4 Pack 91970 ILNAR8B7G…	View on Amazon
	4 pc DENSO Platinum TT Spark Plugs compatible with GMC…	View on Amazon

1. NGK G-Power Platinum Spark Plug LTR5GP (4 Pack) for GMC TERRAIN SLT 2010-2014 2.4L/145

These NGK G-Power plugs are an excellent choice if you’re looking for a reliable, step-up performance plug without the premium price of pure Iridium. The platinum tip reduces the voltage required for ignition, leading to noticeably improved cold starts and better efficiency. They are specifically engineered for the earlier 2.4L models, offering a superior anti-corrosion layer thanks to their trivalent metal plating, which also makes them easier to remove during the next service interval.

Key features that stand out:

• Trivalent Metal Plating: Provides superior anti-corrosion and anti-seizing properties.
• Fine Wire Platinum Tip: Reduces required voltage for better starts and superior acceleration.
• Corrugated Ribs: Designed to prevent flashover and ensure consistent spark delivery.
• Copper Core: Aids efficiently in heat removal, increasing durability.

Pros:
– Excellent blend of performance and affordability.
– Long lifespan compared to standard copper plugs.
– Engineered specifically for 2.4L Terrain engines (2010-2014).

Cons:
– Not as long-lasting as iridium options.

Best for: Value-conscious owners of 2010-2014 2.4L Terrains seeking improved cold starts and reliability.

Expert Opinion: This is a solid maintenance plug. If your budget doesn’t stretch to Iridium but you need better durability than copper, the Platinum fine wire tip on the G-Power series delivers reliable spark stability.

2. 4 pc NGK G-Power Spark Plugs compatible with GMC Terrain 2.4L L4 2010-2017

This G-Power set offers reliable Platinum performance tailored for the full range of the 2.4L L4 engine models from 2010 through 2017. NGK is a trusted brand, often considered OEM quality, and these plugs provide a direct replacement fitment, ensuring installation is straightforward without the need for complex modifications. They provide a noticeable improvement in overall performance compared to old, worn-out plugs, restoring lost horsepower and mileage.

Key features that stand out:

• Genuine NGK Parts: Ensures high quality and factory specifications.
• Direct Replacement: Simple installation and perfect fitment guaranteed.
• Wide 2.4L Compatibility: Fits 2010 through 2017 models.

Pros:
– Reliable OEM-grade replacement parts.
– Cost-effective option for routine maintenance.
– Proven performance consistency.

Cons:
– Standard performance; not designed for high-heat or high-boost applications.

Best for: GMC Terrain owners needing a standard, high-quality maintenance replacement for the 2.4L engine covering a wide range of model years.

3. 4 pc NGK Iridium IX Spark Plugs compatible with GMC Terrain 2.0L L4 2018-2020

For those driving the newer, often turbocharged 2.0L L4 GMC Terrain models (2018-2020), these NGK Iridium IX plugs are essential. Iridium is significantly harder and more durable than platinum or copper, allowing for extremely long service intervals and a much finer electrode tip. This fine tip provides a powerful, concentrated spark, which is crucial for maximizing efficiency and power delivery in high-compression or turbocharged engines.

Key features that stand out:

• Iridium IX Technology: Ultra-fine electrode for maximum ignitability and long life.
• High Heat Resistance: Ideal for the operational demands of the 2.0L turbocharged engine.
• Specific Modern Fitment: Designed specifically for the 2018-2020 2.0L L4 engine.

Pros:
– Maximum durability and longest life span.
– Superior performance and consistent idle, especially under load.
– Excellent resistance to fouling and corrosion.

Cons:
– Higher upfront cost compared to platinum or copper plugs.

Best for: Owners of the 2018+ 2.0L turbocharged GMC Terrain prioritizing the longest possible service life and top-tier performance.

4. 4 pc NGK Iridium IX Spark Plugs compatible with GMC Terrain 2.4L L4 2010-2017

If you own the 2.4L Terrain but want to upgrade significantly beyond the standard platinum plugs, this Iridium IX set is the answer. While the G-Power platinum plugs are great, these Iridium IX plugs offer peak performance and longevity for the naturally aspirated 2.4L engine. By upgrading to Iridium, you can often push your maintenance interval further while ensuring your engine maintains optimal combustion, leading to better throttle response and efficiency.

Key features that stand out:

• Iridium Construction: Offers superior strength and wear characteristics.
• Consistent Performance: The fine wire electrode ensures the spark remains stable over tens of thousands of miles.
• Enhanced Durability: Resists wear and oxidation better than any other material.

Pros:
– The longest possible service life for the 2.4L model.
– Improves performance and efficiency consistency over time.
– Direct fitment for the popular 2.4L L4 engine platform.

Cons:
– Overkill if you plan on changing your plugs more frequently than 80,000 miles.

Best for: 2.4L L4 owners who want the absolute best spark plugs for gmc terrain and prioritize the maximum interval between replacements.

5. UF491 Ignition Coil Pack 12578224 and Iridium Spark Plugs XP5263 Set of 4pcs Compatible with Chevrolet Equinox 2010-2017,Malibu 2008-2014&GMC Terrain 2010-2017&Buick Verano 2012-2017 2.0L 2.2L 2.4L L4

This isn’t just a spark plug set; it’s a full ignition system overhaul. Since ignition coils often fail around the same time as spark plugs (especially in the 2.4L L4 engine), buying a bundled set like this is incredibly economical and smart. This kit includes four Iridium XP5263 spark plugs and four replacement ignition coils (UF491), covering many GM 2.4L applications, including the GMC Terrain 2010-2017. Replacing both components simultaneously guarantees the best possible restoration of engine performance.

Key features that stand out:

• Complete Ignition System Overhaul: Includes both coils and Iridium plugs.
• Extensive Compatibility: Covers 2.0L, 2.2L, and 2.4L L4 engines across various GM platforms.
• Cost-Effective Bundle: Saves money compared to buying high-quality plugs and coils separately.

Pros:
– Solves issues related to weak coils and worn-out plugs simultaneously.
– Iridium plugs provide long-lasting performance.
– Excellent solution for persistent misfire issues.

Cons:
– Quality of aftermarket coils might not match true OEM Mopar units, but they offer great value.

Best for: Terrain owners experiencing misfires or rough idling who suspect both their plugs and ignition coils are aging.

Expert Opinion: Anytime you replace the plugs past 80,000 miles, inspect the coils closely. Since this kit provides quality Iridium plugs alongside new coils, it’s a proactive choice for maximum reliability on the 2.4L engine platform.

6. 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

As the GMC Terrain shifted towards smaller, more fuel-efficient engines (like the 1.5L L4 starting in 2018), the plugs needed to evolve. These Iridium Platinum plugs are specifically designed for the high-efficiency 1.5L turbocharged engine (2018-2024), though they also fit other modern small-displacement GM turbos. The combination of iridium on the center electrode and platinum on the ground electrode creates a highly focused spark for exceptional fuel efficiency and longevity.

Key features that stand out:

• Iridium/Platinum Combination: Designed for maximum ignitability and extended life in turbo engines.
• Exceptional Fuel Efficiency: 0.6mm fine-wire iridium tip design maximizes fuel burn.
• Modern Fitment: Essential for the 1.5L and certain 1.4L Terrain models.

Pros:
– Specifically targets common ignition issues like misfiring and poor fuel economy.
– Ensures stability of high-voltage output across the engine speed range.
– Includes a 12-month warranty for peace of mind.

Cons:
– Owners must verify the specific engine code (1.5L L4) carefully before purchase.

Best for: Owners of 2018+ GMC Terrain models with the 1.5L turbocharged engine who prioritize fuel economy and long-term durability.

7. 4 pc DENSO Platinum TT Spark Plugs compatible with GMC Terrain 2.4L L4 2010-2017

DENSO, like NGK, is an original equipment manufacturer (OEM) often used by GM, making these a highly reliable choice. The Platinum TT (Twin-Tip) technology is DENSO’s unique approach to improving efficiency. These plugs feature a 1.1mm platinum center electrode coupled with a titanium-enhanced alloy ground electrode, resulting in a more powerful, less quenched spark. This translates directly to faster starts and superior fuel economy for the 2.4L Terrain engine.

Key features that stand out:

• Platinum TT Twin-Tip Design: Reduces quenching and generates a more powerful spark.
• Titanium-Enhanced Alloy Ground: Improves durability and consistent performance.
• Improved Durability: Twin-tip structure ensures stable performance over time.

Pros:
– Excellent OEM quality and reliability from DENSO.
– Noticeable improvement in starting speed and stability.
– Strong alternative to NGK options for the 2.4L engine.

Cons:
– While durable, they don’t quite match the extreme lifespan of Iridium IX plugs.

Best for: 2.4L L4 owners looking for OEM-quality components with unique design features to maximize engine response and fuel efficiency.

Expert Opinion: DENSO’s Platinum TT line is often overlooked, but the twin-tip design effectively reduces the amount of metal that cools the spark, meaning you get better ignition than many standard platinum plugs. A superb choice for the 2.4L.

Comparison Short Insights

When choosing the best spark plugs for gmc terrain, the primary decision revolves around the material and the engine size.

For the older, widespread 2.4L L4 engine (2010-2017), NGK offers a clear path. The NGK G-Power Platinum options are the best choice for reliability and value, offering a great upgrade over copper without breaking the bank. However, if you want to install them and forget about them for the maximum interval, the NGK Iridium IX (Product 4) provides superior longevity. Don’t forget the DENSO Platinum TT, which provides excellent response and fuel economy through its unique twin-tip design.

For the newer 2.0L and 1.5L turbocharged Terrains (2018+), you must use Iridium or Iridium/Platinum combination plugs due to the higher heat and boost levels. NGK Iridium IX (Product 3) and the Iridium Platinum 91970 (Product 6) are engineered specifically for these modern, high-output engines and will ensure optimal performance and long service intervals. Finally, if you are experiencing misfires on your 2.4L, opting for the coil and plug bundle (UF491/XP5263) is often the most economical and effective fix.

Final Verdict

Choosing the right plugs depends entirely on your specific GMC Terrain model and your maintenance goals.

• If you own the 2.4L model and prioritize maximum longevity and performance, you should choose the 4 pc NGK Iridium IX Spark Plugs compatible with GMC Terrain 2.4L L4 (Product 4). They offer the best overall combination of durability and reliable ignitability.
• If you are driving a 2018 or newer Terrain with the small turbocharged engine (1.5L or 2.0L), you must use modern iridium technology. The Iridium Platinum Spark Plugs 91970 (Product 6) is the recommended choice for superior fuel economy and stability in the 1.5L turbo.
• If your maintenance budget is tight but you still need a high-quality replacement for the 2.4L engine, the NGK G-Power Platinum Spark Plug LTR5GP (Product 1) offers the best bang for your buck, providing reliable platinum performance at a great value.

Best Spark Plugs For GMC Terrain FAQ

What are the main symptoms that indicate I need new spark plugs in my GMC Terrain?

Common symptoms of worn-out spark plugs include rough idling, difficulty starting the engine (especially when cold), a noticeable decrease in fuel economy, and poor acceleration or hesitation under load. If you experience the check engine light flashing, this usually indicates a severe misfire, meaning immediate replacement is necessary for the health of your catalytic converter.

How often should I replace the best spark plugs for gmc terrain?

The replacement interval depends on the plug material. Standard nickel or copper plugs typically last 30,000–40,000 miles. However, the best spark plugs for gmc terrain (using platinum or iridium) are designed for extended service intervals, often lasting 80,000 to 100,000 miles or even longer. Always check your GMC Terrain maintenance schedule, as some newer turbocharged engines require specialized plugs that must be replaced strictly according to factory recommendations.

Do I need to gap the spark plugs before installing them in my GMC Terrain?

Most modern platinum and iridium spark plugs are pre-gapped from the factory to the correct specification for common vehicles. While it’s always wise to confirm the gap using a feeler gauge (consult your specific engine manual for the exact measurement), avoid adjusting iridium plugs unless absolutely necessary, as the fine-wire tip can be easily damaged.

Is it worth upgrading from platinum to iridium spark plugs in a 2.4L Terrain?

Yes, the upgrade is often worthwhile, especially if you plan on keeping your GMC Terrain long-term. While both materials are great, iridium offers significantly greater durability and resistance to high temperatures and corrosion. This means you can extend your service interval by an additional 20,000–40,000 miles and maintain optimal performance consistency for longer, reducing the frequency of complex ignition system maintenance.

What is the difference between the G-Power and Iridium IX series from NGK?

The G-Power plugs typically feature a platinum-tipped center electrode, offering better wear resistance and ignitability than standard copper at a mid-range price. The Iridium IX series features an ultra-fine Iridium center electrode, which provides the highest level of performance, superior resistance to erosion, and the longest possible lifespan.

My GMC Terrain is misfiring. Should I just replace the spark plugs?

If your Terrain is misfiring, it’s a good idea to inspect the spark plugs, but they are not always the sole cause. Misfires can also be caused by failing ignition coils, defective fuel injectors, or underlying compression issues. If your plugs are relatively new (under 60,000 miles), consider checking the condition of the ignition coil packs, especially in the 2.4L engine, where coil failure is common. Bundled plug and coil kits (like Product 5) are a comprehensive solution if you suspect aging components.