My Passat had a recommendation of fresh oil at 5000 miles using non synthetic. Over time it was discovered that the engines fail. Now the recommendation is for synthetic to avoid sludging failures. The oil life varies vehicle to vehicle depending on the amount of oil in the sump , its operating temperature and how well the rings seal.

Kevin


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...