My dad has my 98 Tahoe and it has been sitting in a garage for 3 years. Before we try to start it, he wants to get the oil flowing so we do not SCAR the cylinder walls, wreck the bearings, or anything from letting all the oil sit for that long. What would you guys recommend before starting? I thought pulling the plugs and spraying in some marvelous mystery oil in each cylinder but that does not solve the bearing issue. Advice would be appreciated.