GM uses ACDelco as its official spark plug brand for factory-installed parts and GM Genuine Parts replacements.
General Motors relies on ACDelco, GM's own parts division, to supply spark plugs that meet the company's original equipment specifications. When you buy plugs from a GM dealer or through GM Genuine Parts catalogs, you are typically getting ACDelco plugs designed for GM engines. There are regional variations and engine-specific recommendations, but ACDelco remains the standard for GM's OE spark plugs.
ACDelco: GM's Official OE Spark Plug Brand
ACDelco is the long-standing supplier and branding used for GM's Original Equipment spark plugs. The brand offers several designs, including copper-core, platinum, and iridium options, all calibrated to GM engine specs.
In GM's official parts ecosystem, spark plugs are indexed under ACDelco part numbers that correspond to a vehicle's model, year, and engine. Dealers will typically confirm the exact part number needed to match the engine's heat range, gap, and thread size.
Where Other Brands May Appear
In some markets or for certain engine families, other spark plug brands may be used under GM specifications. However, for most GM vehicles sold in North America and other major markets, the factory-recommended spark plugs are ACDelco. If you rely on aftermarket parts, check GM's compatibility and follow the specified heat range and gap.
How to verify the correct spark plug for your GM vehicle
To help readers identify the correct spark plugs, here are the steps to verify the right part for a GM vehicle.
- Check your vehicle’s owner’s manual or the GM service information for the exact spark plug specification, including heat range and gap.
- Look up the part number in the GM Genuine Parts/ACDelco catalog for your vehicle’s model, engine, and year.
- Consider the recommended plug type (iridium, platinum, or copper) based on your engine design and maintenance interval.
- Confirm the correct thread size and reach, and set the proper torque during installation.
In short, the most reliable source for the correct spark plug for a GM vehicle remains the official GM parts catalog (ACDelco). Aftermarket plugs can be compatible, but they should align with GM's specifications.
Summary
GM's official spark plug brand is ACDelco, the OEM and replacement part line used for most GM engines. While aftermarket brands can be used in some cases, ACDelco plugs are the standard for factory replacement. Always verify the exact part number, heat range, and gap with GM's parts catalog or your dealer to ensure proper fit and performance.