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I actually just read a post on the Porsche mailing list I subscribe to from a guy who, as an experiment, left the same oil in his car for 35,000 miles. He changed the filter every 4000 and tested the car and oil extensively every time he changed the filter. Guess what - the lack of oil changes made NO NOTICEABLE DIFFERENCE in either the car's performance, engine operation, or even oil performance. He made all these tests with the help of a race mechanic, too, and he's part of a real PCCA racing team, so I'm assuming they were done properly. He finally changed the oil because it was freaking him out to have 35,000 mile-old oil in his car, but you get the picture.
I'm not saying you shouldn't change your oil, but it seems that the old "every 3000 miles" adage no longer holds true for modern engines and oils. Pretty interesting, huh?
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