>to all synthetic oil users, >I called Audi last week regarding the use of synthetics and the answer was >that they do not endorse any kind of oil The BTCC A4 uses Castrol Synth! That is "endorsement" Call "Audi Sport" in Germany! They too do not "endorse" a brand name, but reluctantly admit to using a "synthetic" based oil! How else would the inline 4 "296 HP" engine survive! M