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I'm in the "every 3000 miles" camp, too. Synthetic oil doesn't break down as fast as dino oil, but it still gets dirty. An 80$ oil change (60$ if you do it yourself.... the equivalent of two tanks of gas..) is REALLY cheap insurance. My last five cars all went well over 250K miles w/ virtually no engine problems, and I'm pretty sure that regular oil and filter changes had a LOT to do with it. W/out exception, I had to retire each of those five due to salt damage, and nothing else. Never needed to replace a transmission or clutch either (with the exception of our current MB which was SOLD to me w/ a bad transmission.. long, sad story). Manufacturers have a vested interest in selling new cars, so I have a hard time accepting their 12,500 or 7,500 oil change interval recommendation... or whatever it is on the twins.
Changing your oil is sort of like furling a mainsail.. if you're asking yourself if you should change it (furl it), it's probably already past the time to do it. Just change it. It certainly won't hurt, it doesn't cost that much, and at the very least you'll feel better.
Barry
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