My wife takes her Saturn Vue (came with the 3.5 Acura/Honda engine) to the dealer for oil changes. I told her I could do an fully syn oil change for less then what the dealer charges for they're dino bulk drum oil. But she still insists on the dealer changing it. I told her to go with Fully Syn because she with out a doubt will be keeping the Vue forever. So my question is is there a easy way I could tell if the dealer is really using Syn oil, and not charging for syn, and filling it up with dino?