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I'm assuming that you are talking about synthetic oil? If so, they say you can run it a long time, but I never run oil over 6,000 miles. I would check on the amsoil site for references. I'm going to be using Amsoil soon, but will still change it at 6k mile intervals... Not sure if that helps at all, but I just don't run the oil as far as manufacturers say it will go. They also say that ATF will go 100k miles in the newer Volvos. I have seen it changed at 50k and it looks like opaque coffee. I change ATF at 30k miles...Changing it is cheap maintanance,
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