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Dear All What is the forum's thoughts on the use of premium diesel for Audi engines? I have an A6 3.0 TDI and wonder if it makes any difference to use the more expensive diesels out there. Does it enhance performance/ clean the engine or improve economy; or is this a marketing ploy to get you...

Just bought a new A 6 3.0 TDI Avant Le Mans and wondered about increasing the engine performance of this car- I have heard that electronic changes can give an extra 40 PS. Is this worthwhile and is it a good idea to consider this on a brand new engine? I know that Brabus prefer to fit...