I have been using Mobil 1 on my Audi and push the oil change interval to every 5,000 miles. I do not see much difference whether to use synthetic or organic, if you stick with oil change every 3,000 miles. __________________ 1998 BMW 318ti M-Tech Sport Silver (Gone to member leeko617) CURRENT: 2015 BMW X1, 2004 BMW 330ci Convertible, 1998 Porsche Boxster, 2001 BMW 525i Touring GONE: 2000 Audi A4, 2002 VW Passat, 1985 VW Cabriolet |