fluid dipstick has been discontinued. The transmission fluid level is checked and added through an opening on the side of the sump on early THM R1 (A4S 310R) transmissions. The transmission drain and fill plugs are on the bottom of the sump on later THM R1 (A4A 310R and A4S 270R) transmissions and early ZF A5S 310Z transmissions.
The transmission drain plug is on the bottom of the sump and the fill plug is in the transmission casting on the right rear portion of the sump-to-transmission gasket mating surface on the later ZF A5S 310Z transmission. 86-122 degrees