Quote:
Originally Posted by 330indy
you can't possibly be suggesting that using a different 10w-60 oil (other than TWS; actually a changing spec of TWS) is beyond what the engineers designed for...
especially when the viscosity (Redline for example) is a bit higher.
I have looked into TWS in-depth with one of its design engineers and he himself states it is closer to a 0w-40.
it's tasty Kool-Aid.
but Kool-Aid none the less.
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I think you've answered your own question. BMW have never approved anything other than TWS as a suitable 10w60 oil for the S54. It IS thin for a 10w60.
Please provide all the info you have from your in-depth discussions with the S54 design engineer, as this will be valuable information for the BMW community, especially any amount of quantative data you can lay your hands on.
I may change to another oil myself, but I'm waiting for others to experiment for a couple of years before I make my decision.