Quote:
Originally Posted by Dormermike
got to wonder what all the iterations were for if not reliability!
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Just what is different about index 12 isn't entirely clear to me. From what I've gleaned, the index 12 version may have an internal filter and optimised thermo-compensating oil over the previous version.
But the situation is confusing because it seems BMW introduced an 'index 12.5' if you will, with a new part number for the S63 engine, but that part number is no longer available (according to RealOEM). So I assume the changes to index '12.5' were incorporated into the existing index 12 part number and the new number withdrawn.
You can get the fuller picture here (start at 16:00):
but bear in mind this vid is from 2018 and I think the situation may have changed again since...