Background: I switched my '99 to Mobil 1 at just under 2000 miles. I know, I know -- I'd wait if I had it to do over. Anyway, we don't put that many miles on the Ody and so twice a year appts at the dealer work good. But then my wife got sick and stopped driving for quite a while. So -- March 2001 was my last oil change at 2 years/17,400 miles. Now I'm coming up at the six month interval and ready for another oil change. Mileage: 18,700 miles! For warranty purposes, I guess I need to change the oil but gosh..... I suppose I'm probably an excellent candidate for dino oil instead of synth, but I just can't bring myself to do it. Maybe I will have the record for least mileage on a crankcase full of synthetic oil.