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Originally Posted by dparm
Quote:
Originally Posted by jphughan
Agreed on 0W always flowing better regardless of ambient temp, but the benefits diminish as temperature climbs, and those benefits have to be weighed against the issues already discussed above and elsewhere in this thread.
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M1 0w40 is quite stout and can take high-temp/high-stress use just fine.
It's not exactly a direct trade-off...you truly can get excellent low and high temp protection from a single oil these days. Don't believe me? Go look at the countless UOAs. |
I'm referring more to the highly uncertain approval status, the extremely limited information on how well it performs in our specific engines, the total dearth of information on any long-term effects, and the fact that on top of all that, there is still no meaningful evidence whatsoever that it actually does reduce bearing wear. Reasonable theory does not always play out in practice, and one or two Blackstone Labs reports and does not count as reliable, generally applicable information.
That's what has to be weighed when considering using 0W-40 over the 10W-60 that BMW has unquestionably approved.