Hello, I have a question for all you oil experts. I just paid wwaaayy to much for the 15 k Capped Svc. on my 2012 FG XR6 TURBO. Afterwards I noiticed they put Full Syn. 5w-30 in it rahter than the recommended 15w-40. The short question is. Should I take it back and have them change it out? Thanks!