I did a search on ATF fluid and transmission fluid without much success so thought it would be a good idea to have a single thread listing compatible/correct ATF to use for tiptronic boxes. As we know Audi main dealers & specialists charge anything from Â£25-Â£33 per liter which (many feel) is a little bit of a rip off. Also some places (and posts) state anything between 5-9 liters to refill once tranny sump removed. Note it should be the higher number if the filter/strainer is removed at the same time: Audi main Stealer Â£32.88 inc VAT per liter (Shell M.1375.4/Lifeguard 6) Â£295.92 Â£76.06 inc Vat filter/strainer/gasket (Â£37.73 of which is just the rubber gasket!!) Â£371.98 inc VAT total Bristol Transmissions Â£15.60 inc VAT per liter Lifeguard 6 Â£50.40 inc Vat filter/strainer/gasket (part no BTL2028) Â£190.80 inc VAT total Total saving of Â£181.18 in parts alone! Annoyingly I have 10l of Esso LT 171141 (for my Jaguar) in my garage which is effectively Lifeguard 5 which I've been told isn't compatible...boo hoo hiss!! So anyone found anywhere cheaper for the parts?