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There are 4:
OE - original to the car, referred to as "Genuine BMW."
OEM - the company (manufacturer) that made original (any parts) parts for our car. Bosch made OE parts for us, but not our oil filter so that bosch part would be OEM, for example. Our oil filter is made by Mahle (iirc), so that would be an OES part if bought from Mahle (via FCP/ECS).
OES - A part that is identical to OE (often has BMW logo ground off), still made by the same company that made it originally for our car. Unfortunately, however, these days, the companies are moving production of these parts to China, so I don't really know if we can still call them OE(S) - are they really of comensurate quality now?
Aftermarket - Any part made by a company that never made parts, originally, for the vechicle in question.
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/// 2004 Silvergrey M3 · Coupe · 6MT · Slicktop · zero options
/// 2011 Jerez/Bamboo E90 M3 · DCT · Slicktop · IG: @na.s54
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