OE suppliers vs. aftermarket - what the tiers mean

OE Supplier brands manufacture the part that left the factory fitted to your car. Bosch, Denso, Valeo, Mahle, Lemforder and NGK all supply vehicle makers directly.

Premium aftermarket brands such as Brembo, KYB and Monroe engineer to OE specification or above, while value and fluids ranges cover older vehicles and routine service jobs.