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Originally Posted by Brucelee
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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It seems to me that oil change intervals are something that nearly everyone has a fairly strong opinion on, but little data. I did at least send a sample of 9k Redline from my WRX to be analyzed, and everything was fine. I don't have those results here, but brucelee, do you remember what it was that was making the oils you mention in this post and others "shot"? Was it TBN, PH, metal contamination, or? I have always been interested in lubricants, and spent most of the last 30 years living in temps down to 60 below, in which conditions they can be critical. TIA, Alan.
PS BTW, has anyone sent any of the 20k oils in for analysis, I'd love to know the results...
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