Ditto to what McGyver said. I go to Wal-Mart, get the oil and filter off the shelf, take it to the tech, and go eat Subway for lunch while they do the work.
Ya, As soon as you leave, the cheap oil goes in your engine and your oil in the tec's toolbox, seen it done many times lol

Bought a lot of good ole Amsoil that way (cheap)
