The full synthetic is a must...good job!I just do the services at the intervals suggested by the service booklet. Continued to do so even after warranty expired. An indy shop now does the work, as directed by the booklet, now that I am beyond the S&S warranty. Only changes I have stipulated is for use of full synthetic motor oil, and tire rotations. Yes it is more expensive than a simple oil change ala Jiffy Lube, but the car has remained trouble free so I am happy. 2012 S60 T5 FWD 139,500 miles.