Quote:
Originally Posted by SenorFunkyPants
Castrol and BMW work together to develop the 10W60 oil for use in certain M engines and continue to recommend it for some 12 years. The specific property of this oil that is desired is its high film strength which comes at some cost - financial and in decreased efficiency.
The apparent attraction of Mobil 1 is that it is cheaper, a little bit thinner and lots of manufacturers use it.
So lets change from an oil in constant development for this engine to a generic one customized for no one. An oil with a lower film strength that will be thinner at high temps and at a lower pressure.
What could possibly go wrong?
Well there is the rise in iron shown in uoas and a rise in oil consumption.
But apart from that.
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There is also a significant decrease in bearing wear metals and those who have tested it have proven oil pressure to remain in the acceptable range
