I've got a 2000 1.8T manual atw with 192,000 miles, and I'm beginning to like it again, so I thought I'd change the original Gear Oil. I read many opinions about GL4, GL5 and I went with GL5 with the MT 1 rating for both front and rear. Screw the yellow metals, and I think the MT 1 has solved that. I ordered the special socket, from China, to change the front.

In front it is a 17 MM hex to remove the fill plug and the special socket to remove the drain, and I worked in that order because you don't want to drain it if you can't fill it. I removed about 2 qts and installed 3qts. There is no need to remove the wheel. Even though it was on ramps, thus not exactly level, the geometry down there would lead one to believe that most of it came out, and the fill plug is at about the half shaft mid point level so there is plenty of room in there above the fill hole. So I'm not too worried about over filling. I ran a hose down from above and cut the nozzle off of the oil bottles to fit nicely into the hose,and drained it in, constantly breaking vacuum by pulling the nozzle out slightly to let air back into the bottle. I can't imagine hand pumping 3 quarts of that stuff.

The rear is 10mm hex for both plugs. Again on ramps in the rear. about 1.5 qt out and 2 qts back in. The hose required a little duct tape engineering as I taped the hose to the gas tank below and to the tire above and worked from right beside the gas tank fill location.

By the way, neither fill plug ever overflowed, I just quit at 2 and 3 quarts.

One of my half shaft seals is leaking a bit on the rear, and the front looked pretty good, but there is so much oil/gunk up there it is hard to tell.

This was a very simple job.

 

Assuming it's a Quattro, your 3 Qt's is about right. But you have to ask yourself why it only had 2 Qts in it. Your leaky seal is a problem, and trannys are expensive.

I'm not going to look up the fluid you used, but the yellow metals stipulation does matter!

 

Please report back to the forum with a source where you can document yellow metal failure from using modern GL5 at a temp below 200 degrees F.

 

I'm not writing a paper here.

 

please link, because I don't want an opinion. I want data and link.