Picked up my project car Cosmo from the latest repair. The gearchange was always a bit sloppy but baulky at the same time. Last Friday the original 5-speed box lost gears 3-5 - but it was on 287000 miles and third was always a bit clunky. As luck would have it, I had a spare GPK box (~140000 miles) from my 04 Tdi that was replaced with a PTW last July, and the mechanic who did that swap lives 100 yards away. Brief delay to order a bottle of 75W90 gear oil, and the car went over on Thursday. Swap finished last night complete with a gearbox oil change and replacing the white plastic slider bush (the block attached to part 47 in https://audi.7zap.com/en/rdw/audi+a2/a2/2003-248/7/711-711030/) that contacts the selector counterweight (which always looked really ropey) - and I've just gone for a test drive. The same box in my other car used to be quite heavy and mechanical (compared to our AUA car). The oil change and slider bush has worked wonders - the gear change is smooth and light and precise - not quite an AUA but very close to this. Much better than it ever was in the other car - and I am now thoroughly convinced of the benefits of new oil to a Tdi gearbox having experienced the comparison. The slider change has also got rid of the sloppiness in the left-right gearchange planes. Didn't even have to adjust the cables. My one fear was that the car may have the early A2 speedometer feed from the gearbox instead of the ABS sensors, but this proved not to be the case, so job done. Very happy.