Add to the above good advice, I would recommend synthetic engnine &
drive lubricants along with superior oil & air filters. To further show
how you can put the wallet sucking dealer on the ropes, use an oil
analysis once in a while to show that the oil doesn't need changing or
injectors need his money grabing fingers. In addition to Amsoil
synthetic engine lube I use an injector cleaner, P.I.