Originally Posted by TiGeo
Why do people feel that the manufacturer of the vehicle doesn't know what an appropriate OCI is for the given oil they spec?
Because manufacturers are looking at better CAFE ratings for their fleet, then getting a vehicle past the warranty period, then primarily to 100,000 miles for reliability ratings, then they don't care.
Many here want to keep their vehicles past 200,000 miles (or are buying these 100,000+ mile vehicles).