Hi all, I'm going to change my gearbox oil and rear diff oil on my 04 1.9 q. My gearbox code is FYC. Audi tell me that theres many different oils for different gearbox codes and wont give away details of whats realy needed !! I believe I need 2.5 litres for box and 1.5 litres for rear diff. Can anyone confirm this ? Audi want Â£47.52 for 3 litres of gear oil and Â£34.75 for the 1.5 litres of diff oil. A total of Â£82 for about a gallon of oil seems steep. I realise the correct grades are required and will likely just have to stump up as its the transmissions insurance and therefore worth it, but is anyone out there using alternative oils in their transmission that are possibly a bit easier on the wallet but meet the required spec ? Do people think the prices I have been quoted are fair enough ? Any info appreciated, thanks.