Could do with checking the correct oil to change the diffs and gearbox on my manual B6 2.5tdi Quattro. Rang up my closet Audi stealer and they quoted me £30 for 5 litres of 75/90 semi synthetic oil. Not sure if they were just fobbing me off with any old oil.
Is this the correct grade? Would appreciate members input into good suppliers and recommended oils for the Quattro service.