Quick answer
Neither option wins in every case. Aftermarket parts are new, widely available and often cheaper; quality ranges by brand. Second-hand OEM parts are original and can fit perfectly, but their previous wear and unknown history can be risks.
Aftermarket parts — pros & cons
- Pros: New parts, quick availability, competitive price; some premium brands match or exceed OEM performance.
- Cons: Quality varies by manufacturer; very cheap parts can wear faster; may require research to pick reputable brands.
Second-hand OEM parts — pros & cons
- Pros: True OEM fit and materials; good choice for discontinued parts.
- Cons: Unknown wear/age; limited or no warranty; availability depends on salvage stock; may need cleaning/refurbishment.
Cost & warranty
Aftermarket parts typically cost less than new OEM and come with a store or brand warranty. Used OEM can be cheaper up front but often lacks a solid warranty, so the total cost of ownership can be higher if replacement is needed sooner.
Reliability & safety
Choose reputable aftermarket brands with tested specifications. For safety-critical systems (brakes, steering), avoid unknown or ultra-cheap options and prefer certified aftermarket or verified low-mileage OEM take-offs.
When to choose which
- Pick aftermarket for routine service parts (filters, belts, pads) from trusted brands or when you want a warranty and easy availability.
- Pick second-hand OEM for rare/discontinued components or cosmetic items when condition can be inspected and verified.
Bottom line
Buy the best-quality part you can verify. For most maintenance jobs, quality aftermarket brands are a safe, cost-effective choice; used OEM is best for hard-to-find components with inspectable condition.