[KevinH1990]

Originally Posted by blue2000s

I would love to see anyone, with any engine, show a correlation between oil change intervals and engine longevity. I have never seen such a study anywhere.

I believe any answers that you get to this question will be anecdotal at best.

I think Consumer Reports did a study several years ago. If I recall correctly they used New York City taxi cabs. They tested a range of oils and then tore down the engines after 50,000 miles and measured the wear. I'll see if I can find the article. Memory tells me that they didn't find any extraordinary differences between oils. Fuel economy was slightly better with synthetic oil, but not enough to justify the higher price.

Having read reports of engine failures on this and other Porsche boards, I don't recall any in which the owner says they neglected oil changes. Most seem to say that they changed the oil frequently.