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Why would GM do such a thing (like recommend what looks like long change intervals)?
1. There are plenty of yahoo people out there who don't do ANYTHING to, or about their engine oil until something happens, usually bad. For them, this would mean changing the engine oil a lot.
2. Oil is a lot better these days, so some sort of engine analysis could be argued as very needed today.
3. In order for your engine to break in properly, a certain number of metal peaks must be worn down or smashed off, microscopically. So, SOME wear is not altogether a bad deal. Failure to wear in can be, in some ways, just as bad. So the engineers came up with some happy compromise number. Me, I would change every thou, for 3 thousand miles.
4. As a marketing tool, this is different. OOOOOhhhhh, must be something complicated and scientific! Marketing people eat that stuff up.
Finest regards,
troy
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2004 VW TDI PD on bio
want to build 150 mpg diesel streamliner.
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