Guys, Fuchs Titan Sintofluid SAE 75W - 80 is recommended specification for VW TL 521 71. This specification is for the lighter weight gearbox oil, part number G 052 171 A1 as noted above. The standard gearbox oil (part number G 052 532 A2) is a 75W - 90 oil. Opie oils sell it (although it's cheaper on Ebay).
Have you got them part numbers mixed up?
If the 'A1 p/n is the lighter stuff that would suggest he's just replaced the lighter stuff with the thicker stuff
What's the price difference between Fuchs and vag one?