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supposedly the BMW thing is because they have 6-7L or something compared to the traditional japanese import having 4-5L, so it "lasts" longer", i remember someone with an e92 telling me the manual SAYS 15,000km.
I change mine every 8-10k (depending how hard i've been on it) with regular... not that I beat on it, she's my daily anyways... OE/OE replacement filters, whatever works and isn't that paper thin fram stuff...
Judging (and having seen tons of oil) my own oil, it's still quite clean as it comes out, so it's literally a gigantic waste to have to change it... 2x-3x/year for me.
Also use the regular pennzoil stuff... nice and thick.
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