Genuine vs OEM vs Aftermarket Parts: What's the Difference?

"Is it genuine?" is the first question most customers ask. But there are really three categories, and understanding them saves you money without gambling on quality.

Genuine (OEM-branded) parts

These carry the car manufacturer's own branding and box — a Mercedes part in a Mercedes box. They're made to exact factory spec and usually carry the longest warranty. They're also the most expensive.

OEM (original equipment manufacturer) parts

Here's the part most people don't know: many "genuine" parts are actually made by specialist suppliers like Bosch, Mahle, ATE, Sachs or ZF — the same companies the car maker uses on the production line. Bought under the supplier's own brand, an OEM part is often the identical component for noticeably less money.

Aftermarket parts

Made by third parties, aftermarket parts range from excellent to poor. For some items they're a smart budget choice; for others — brakes, suspension, anything safety-related — we'd steer you toward genuine or OEM.

So which should you buy?

• Safety-critical parts (brakes, steering, suspension): genuine or top OEM
• Service items (filters, plugs): quality OEM is usually the sweet spot
• Older or higher-mileage cars: OEM keeps costs sensible without cutting quality

We stock all three where it makes sense and we'll always tell you which is which. Message us your car and part and we'll lay out the options honestly.