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So I read through this entire post and didn't see this mentioned, so I'll ask. There is a large wealth of knowledge here and I am sure someone can provide some insight.
I read somewhere that one thing to be very concerned with on our engines is the tendency for the oil to foam up, and there are some oils designed to avoid this. I believe what I read said that this can wreak havoc on the VANOS system if the oil does foam up, and cause VANOS failures and premature oil breakdown.
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