I don't care if a vehicle is under warranty or a maintenance agreement. I ALWAYS change my own oil/ filter and do all of my own maintenance when practical. Keep your receipts and a good maintenance log if there are issues with major warranty repairs later on. People don't realize that the "techs" doing alot of work on cars, especially lube are also the fellas that wash cars and sweep the lot. The experienced techs don't do that grunt work.