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Dstrick, the carbon cleaning was $400. And although we would like to think things go smoothly when working on a car, it takes about 6-8 hours. It's a pretty tedious job getting all that crap off the valves.
As for oil changes, I think 15000 is a bit long, but I would say you could easily get 10000. On my last car (Acura TL-S) a lot of guys did tests on their oil after 5000 and then 7500 miles and the reports were that the oil was not or just barely broken down. All of us use full synthetic so I can't imagine there is much difference. I'll see if I can remember the name of the lab that did the testing.
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