OEM vs. Aftermarket Parts: An Honest Comparison
Neither slogan — 'OEM only' or 'aftermarket is identical' — survives contact with a real repair plan. What the part types actually are, what California law requires, and how the decision should be made.
Published 2026-07-29 · Last reviewed 2026-07-29
Every collision estimate lists parts, and every part carries a type: new OEM, aftermarket, or recycled. The argument about which is 'right' is older than most of the vehicles involved. The truthful answer is that it depends — on the part, the vehicle, the policy, and the manufacturer's repair procedures.
The three types, plainly
New OEM parts are made by or for the vehicle's manufacturer — the benchmark for fit and material, and usually the most expensive. Aftermarket parts are made by other companies; quality genuinely varies, from certified parts that fit well to parts that cost hours of extra labor to make fit. Recycled (used OEM) parts came off another vehicle — original engineering, with the condition and history of a used part.
Where the choice narrows
For cosmetic panels — bumper covers, hoods, fenders — reasonable repair plans use any of the three, driven by policy terms and availability. For structural components, welded parts, and anything in the crash-energy path, manufacturers publish repair procedures and position statements that often restrict substitution, and a shop following the procedures will follow those restrictions. Sensor-bearing parts deserve extra care: a bumper cover's thickness and material can affect the radar behind it.
Your rights in California
If aftermarket crash parts are used in an insured repair, California requires written disclosure to you, and insurers that specify aftermarket parts take on obligations regarding their quality. The Bureau of Automotive Repair requires that your final invoice identify the parts used. You can also simply ask — before the repair — which types are planned and whether OEM is available under your policy, sometimes for a price difference you may choose to pay.
How we handle it
The repair plan starts from the manufacturer's repair information, then reflects your policy and your choices. We tell you which part types the plan calls for, flag anywhere substitution is restricted, and put the final parts list on your invoice — as the law requires and as you'd want anyway.