The trouble is... it's difficult to know which aftermarket parts are okay and which aren't. I used a Meistersatz aftermarket transmission filter on my E53 and it has worked perfectly. I buy cheap window regulators, as I find there is little/no difference in life compared to the OE units (my experience from my e46). But in general, you're right.... when in doubt, use OE or OEM parts.
AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)
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