The GMC Sierra is a workhorse that needs dependable components. Whether you're towing a trailer or commuting on the highway, the right spark plugs keep your Sierra's engine firing on all cylinders.
Sierra Engine Options
The Sierra comes in 4.3L V6, 5.3L V8, and 6.2L V8 configurations. All three are members of GM's EcoTec3 family and are engineered for iridium spark plugs.
Best Plug for the 5.3L V8
ACDelco Professional Iridium plugs are the OEM choice for GM vehicles — they're what your Sierra left the factory with. NGK Iridium IX are an excellent alternative that many Sierra owners prefer for the slightly sharper throttle response.
Maintaining the 6.2L
The premium 6.2L V8 is a serious engine. Stick with ACDelco iridium OEM spec plugs or NGK iridium alternatives. Don't cut corners on the plug that goes in GM's top-performing naturally aspirated V8.
Towing Considerations
If your Sierra spends a lot of time under load (towing fifth-wheel, flatbed, or equipment trailer), inspect plugs at shorter intervals. High-load operation can accelerate electrode wear and lead to misfires under heavy throttle.
Find the right plugs for your GMC Sierra at Texan Supply — free shipping on all orders.