Not to put too fine a point on it but M1 never said that it's 0W-40 oil is good for 20K miles. They tell folks to follow their manufacturer's recomendations.
Of course, that way, they are off the hook, as it is Porsche's recommendation.
It IS notable that for its PREMIUM oils, ie the ones that are more expensive than 0-40, they say you can go to 15K MAX.
Again, if you really want to drive around with oil that is OBJECTIVELY shot for say another 8K miles, hey, more power to you.
If you you don't buy my line of reasoning, spend a few bucks and send a sample of that 20K oil to Blackstone.
You may get some religion!
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Rich Belloff
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