Browsing the Audi forums I came across the practice of adding 2 stroke oil when filling up. Some swear by it, saying it makes the engine quiter, improves economy etc. Others say you're just messing about doing that and may even clog the injectors. I'm siding with the latter.
Just for interest's sake, do any of you add 2SO to diesel?
Just for interest's sake, do any of you add 2SO to diesel?