ecmilley Posted January 30, 2012 Report Posted January 30, 2012 getting to be more and more oil specs for even the same grade, in north america we have a new gf5 oil and for gm there is dexos certification, getting tougher to stock oil for everyone. seen that same sludge in many bmw's before as well even running euro spec oil, and german filters, have found out since if you want to run 20000km drain intervals requires a special oil filter (has what looks like a sock over it) to refine the oil even more.
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