[Steiglitz]

To the original poster: Do you drive a lot of short trips? Does your oil not get fully heated? Lots of short trips and/or lots of driving with the oil not yet up to temperature can cause fuel dillution in the oil. This can eventually cause sludging of the oil in many engines. But don't dispair! Just get your ride on the freeway for at least 30 minutes once or twice a week and this will cause the fuel to work it's way out of the oil sump. Doing this will allow your engine to last longer too.

Fuel dillution is normal for all engines, especially if one drives their car on lots of short trips, in city stop and go especially. These folks should change their oil more often, as this will also mitigate the fuel dillution issue.