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Oil gurus, here is my second report after 7700 miles. This time around I had both TAN and TBN analyzed. The first report was on 10w60, the second is on 0w40 Mobil 1. My usage/commute is roughly 50:50.
My TAN was higher than TBN at 7700miles yet BS is suggesting I try 9000miles on my current fill?
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2015 K46 S1KRR 
2008 E90 M3  |