Hi. The letter I attached below is what I sent to Blackstone with my oil sample. Its pretty well explained what the story of my car is. I usually buy always the "full synthetic" oil. Its just makes me feel better. This particular car and engine set up is proven in the audi community to run very good even in the $20 specials in jiffy lube and some unknown oil filters. So any better oil would work as bad as any regular conventional oil. And I decided to run the 100% synthetic group IV(is it really like Signature series) Amsoil 5w40 classic saps. Its again about the feeling. I am well aware that it probably make no difference especially in the mileage I put on it. And second reason it is because its kind of cheap. I am lucky enough to be near one of the 11 Amsoil warehouses in the US in which you can go pick it up and avoid shipping which would jack up the price. I have the $10 membership and 1 qt of this oil is $6.85 (instead of $9.45+tax) and 5qt cost me $34.25+tax. only thing I have to do is order it online and go pick it up in 2 hours. If you show up there you cant buy but they have a phone line which you call and pay over the phone and then they give it to you. But this is their own warehouse, not a dealer. Its like 4-5 miles from me. For my other german cars I use always different oil brand with the correct spec. I have put Castrol, Mobil, Valvoline VW502 specs in this car before. I am not sure this is a good idea but I change oil brands a lot. I probably will try some Motul or Red line too. One problem i am having reading this forum for the last 2 years is that i cant settle on a certain oil and keep using only it. If someone gives me a "professional" opinion i would feel better.
Last edited by a moderator: