quote:Just an educated guess, your not getting your oil hot enough to burn off the potential condensation and fuel. But maybe there is no condensation and fuel to burn off, or if there is, it's benign. Under your conditions, it would seem prudent to change oil every 6 months. Castrol Syntec is reasonably priced. You could have a UOA done, but then you could use that money for your next oil change. I personally would skip the UOA, unless your were just curious.
Most of my trips are less than 6 miles and often in heavy traffic.