A buddy just bought a Mini Cooper and is planning to sell his Suburban due to gasoline prices. The fill cap says Castrol. The dealership told him it only needed oil changes at 15,000 mile intervals. Just thought I'd bring it up for discussion, not that I'm going to make any recommendations to him other than what the dealer told him. He'll probably sell it for a diesel Excursion when he gets tired of being cramped up in that little car. Probably before the first recommended oil change.