Quote:
Originally Posted by Efthreeoh
Proof? I have an N52 with 425,000 miles and an average lifetime OCI of 12,400 miles. I've opened up both the top end and bottom end for gasket replacements, not a speck of sludge. I've only ever used BMW LL-01 and OE/OEM MANN HU-816 filter. Several change intervals went 18,000 miles, numerous went 17,000 miles.
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My car is about the same as far as BMW spec oil, change intervals, and MANN filter, but only 111k miles. During warranty BMW only changed oil every 15k-20K miles, and I only started to change oil myself after 50k miles, every 7.5k-12k miles. Recently, every 5k-7.5k miles. So, based on your observations, the BMW spec oils also do a great job cleaning. But you visually inspected, and I do not plan to do that, no need yet.
I do not see any measurable oil consumption, my oil level always stays at the max mark until changing oil. It's a bit strange, but not complaining. I figured that although the Valvoline R&P is not BMW specs oil...for 2-4 oil changes under normal driving and oil filter replaced after 500 miles, 1500 miles, 2500 miles, and 5000 miles should not hurt. Then will go back to BMW specs oil.
The Oil Geek guy (Lake Speed Jr) confirmed to me via email that in his opinion this will not harm my N26. He seemed to had some reservations about this method for BMW diesel engines, which mine is not.