What Spark Plugs Fit a 2015 GMC Terrain?
Spark plugs part numbers catalogued for the 2015 GMC Terrain (2.4 L petrol, 4-cyl, 185 hp), the engine variants that change them, and how to replace them.
For the 2015 GMC Terrain with the 2.4 L petrol, 4-cyl, 185 hp engine, the parts catalogue lists Omnicraft QSP5 as a spark plug. The 2015 Terrain was built with 5 engine variants (from 2.4 L to 3.6 L); this part number is catalogued for the 2.4 L petrol, and other engines can take a different spark plug. GMC’s maintenance schedule for the 2015 Terrain lists the spark plugs every 97,500 mi.
Last updated: · Source: aftermarket parts catalogue
2015 GMC Terrain spark plugs: key facts
| Catalogued engine | 2.4 L petrol, 4-cyl, 185 hp |
|---|---|
| Part numbers | QSP5 (Omnicraft) |
| Catalogue listings | 1 spark plug, 1 brand |
| Engine variants (2015) | 5, from 2.4 L to 3.6 L |
| Fit is decided by | The engine, the thread size and reach, the heat range and the electrode gap |
| Manufacturer interval | Every 97,500 mi (GMC) |
| NHTSA recalls: engine | None of 3 on record |
| DIY | Moderate DIY (gap matters; harder on V-engines) |
Sources: aftermarket parts catalogue (part numbers, engines), manufacturer maintenance schedule, NHTSA recalls.
Spark Plugs: what it does & when to replace it
Spark plugs ignite the air-fuel mixture in each cylinder. Worn plugs cause rough idle, misfires, hard starting, hesitation, and reduced fuel economy. Service intervals vary widely by plug type: copper plugs last around 50,000 km, while iridium and platinum plugs can last 100,000–160,000 km. Always match the manufacturer heat range and gap. Replacement is a moderate DIY job — straightforward on inline engines but harder on V-engines where the rear bank is hard to reach. Electric vehicles do not use spark plugs at all.
DIY difficulty: Moderate DIY (gap matters; harder on V-engines). Always confirm the correct part for your exact build by VIN before buying.
Which engine does your 2015 GMC Terrain have?
The 2015 GMC Terrain was sold with 5 engine variants, and the correct spark plugs can differ between them. This is the single thing a year/make/model dropdown cannot tell you.
| Engine | Fuel | Cylinders | Years |
|---|---|---|---|
| 3.0 L 268 hp | Petrol/Ethanol | 6 | 2010–now |
| 2.4 L 185 hp | Petrol | 4 | 2009–now |
| 2.4 L 185 hp | Petrol/Ethanol | 4 | 2009–now |
| 3.6 L 305 hp | Petrol/Ethanol | 6 | 2012–now |
| 3.6 L 305 hp | Petrol | 6 | 2012–now |
Engine variants catalogued for this model (parts catalogue), filtered to those built around 2015. We hold catalogued part numbers for the base engine only — decode your VIN and we resolve your exact engine, then the exact part. Full dimensions and specifications for this vehicle are on the 2015 GMC Terrain overview.
How to replace the spark plugs on a 2015 GMC Terrain
- 1With the engine cool, remove the engine cover and disconnect one coil pack or plug lead at a time (do them one at a time to keep firing order).
- 2Blow out debris from the plug well, then unscrew the old plug with a spark plug socket.
- 3Check the new plug’s gap against the manufacturer spec and adjust only if needed.
- 4Thread the new plug in by hand to avoid cross-threading, then torque it to spec.
- 5Reconnect the coil/lead (a dab of dielectric grease helps) and repeat for each cylinder.
⚠ Match the exact plug and heat range for your engine; V-engines’ rear bank can be hard to reach.
These are general steps for the ignition category. Exact fastener locations, torque values, and the correct part number depend on your 2015 GMC Terrain’s build — confirm by VIN before you start.
Compatible parts for your 2015 GMC Terrain
Real spark plugs options catalogued for this 2015 GMC Terrain (parts catalogue), shown for the base engine (2.4000 L Petrol). Each links to live marketplace listings for that exact brand and part number.
| Brand | Part number | Note | Shop |
|---|---|---|---|
| Omnicraft | QSP5⇆ cross-ref |
Spark Plug | Find this part → |
Compatible options shown for the base engine — exact fit can vary by engine and trim; confirm with your VIN before buying. Part data: aftermarket parts catalogue.
Shop spark plugs for your 2015 GMC Terrain
Browse spark plugs listings from major marketplaces. Confirm fitment by VIN first — use VinSnap above to get the exact part number for your build before purchasing.
Find the exact spark plugs by VIN
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Decode my VIN →Frequently asked questions
What spark plugs fit a 2015 GMC Terrain?
For the 2015 GMC Terrain with the 2.4 L petrol, 4-cyl, 185 hp engine, the parts catalogue lists Omnicraft QSP5 as a spark plug. The 2015 Terrain was built with 5 engine variants (from 2.4 L to 3.6 L); this part number is catalogued for the 2.4 L petrol, and other engines can take a different spark plug.
How often should the spark plugs on a 2015 GMC Terrain be replaced?
GMC’s maintenance schedule for the 2015 Terrain lists the spark plugs every 97,500 mi. Spark plugs ignite the air-fuel mixture in each cylinder. Worn plugs cause rough idle, misfires, hard starting, hesitation, and reduced fuel economy.
Can I replace the spark plugs on a 2015 GMC Terrain myself?
Moderate DIY (gap matters; harder on V-engines). Allow about 1 hour. Tools: spark plug socket, ratchet + extension, torque wrench, gap gauge, dielectric grease. Match the exact plug and heat range for your engine; V-engines’ rear bank can be hard to reach.