Quote:
Originally Posted by Scharbag
I think the point that we should note above, as it has been voiced in other threads as well, is that the S65B40 does not have enough oil flow at high engine speeds. This, as shown by the results posted by AutoTalent, is primarily due to the tight tolerances chosen by BMW. A stop-gap could be to use thinner oil to increase the oil flow across the bearing surface (at what other consequences I have no idea). The best solution: change the clearances to best-practice standards (rod bearings, main bearings, side clearance) and use the thinnest oil that provides proper protection at the highest RPM/temp that the engine will see. This is not cheap and certainly impractical for 99.9% of S65 and S85 owners.
We can at least address the rod bearings without a total tear-down...
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IME, 14k on 0W-40 did absolutely nothing to reduce bearing wear on OEM bearings with overzealously cautious warm up routines. They actually looked well on their way to the 60k bearings I pulled out.