I used to have the sears repair guy change oil in my lawn tractor and Jiffy lube do my truck oil changes. well the lawn mower engine blew up because the tech didn't put oil in the engine like he said he did. I had more oil on the floor then in the engine and jiffy lube almost caused the same problem. lucky of me I was watching when they did the service and I caught them. I don't go to jiffy lube any more and I do all my own oil changes now. and I always double check my own work. you know the saying if you want it done right---