OEM vs Aftermarket: What Actually Differs

The honest version, category by category, including where aftermarket is fine.

Where It Genuinely Matters

Anything the vehicle’s electronics are calibrated around: brake friction, oxygen sensors, wheel bearings with integrated speed sensors, blend door actuators, cameras and radar. These are not opinion cases.

Where It Matters Less

Wiper blades, some filters, floor mats, bulbs and general hardware. We sell OEM, and we will still tell you this.

The Fit Argument

Body panels, lamps and trim are the most visible place a near-fit shows up. Panel gaps and lamp cutoff patterns are certified values, not preferences.

The Warranty Argument

Genuine GM parts bought over the counter carry their own parts warranty. Read the terms before assuming coverage either way.

Shops and fleets can set up wholesale pricing at gmpartsclub.com/wholesale. Everyone else can start at our Chevrolet OEM parts catalog or search for GM parts.