Dear forum, yes, I know: the BITOG mantra is "synthetics don't protect better, but they protect longer." A short while ago, a user signed up in a german forum and asked for advice selecting an oil for his next oil change, and also on proper oil change intervals. The car: a V8 Jaguar. Mostly short-tripped. And driven mostly during winter months. When he changed his oil, thankfully he supplied us with an UOA: [img]http://oil-club.de/index.php?attachment/6196-oelcheck-2017-jpg/[/img] Source: Mobil1 Protection Formula 0W-40 (SuperSyn) - Jaguar XJR V8 - 4.500 Km / 10.200 Km Wear metal seem high for the mileage, but with a severely short tripped car, higher wear is to be expected. Astonishing is the state of the oil. We do not see TBN and TAN, but ocidation, nitration and sulfation are quite astonishingly low for a nine-years-and-four-and-a-half-month oil change interval. PAO rock. Period.