2000 Audi S4 6 speed manual - when replacing quattro front transaxle lube, are both drain plugs removed to drain transaxle?

there should be 2 places where you can fill the gear oil and drain the gear oil they are most likely allen wrench fittings make sure you remove the filler one first because if you take the drain plug out first and cant get the filler plug out you are screwed.

I search google for 2000 Audi A6 Quattro manual online
https://manuals.co/workshop/audi/a6

http://bookgedebook.tk/downloads/2000-audi-a6-quattro-owners-manual.pdf

You have to remove one of the two, might as well replace the clutch while you're in there (if it's a manual)

Replace the transmission housing is what I would do.

Get a used pump & do the drain mod &
loctite the new seal in place

Could be the converter hub is not running true
& took out the seal

The thermostat is located in front of the engine, between V cylinder banks, for Audi A8 V8 4.2 Quattro Automatic. See pictures below:




Remove the thermostat housing (2 bolts) and the old thermostat. Note the orientation of the old thermostat (vent valve facing UP). Clean both thermostat housing and block surfaces and remove all traces of old gasket material. Install the new thermostat vent valve facing UP.

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Some can be repaired the first thing is to try a little wd40 in the key hole and work key in ignition, the spring back action is done by the switch not the ignition cylinder locjk, but if the lock binds up it will cause it not to return, so start with the lube, after a few days if it still doesnt return then remove covers and replace the switch on the back of key switch. hope this helps, most of the time the lube works.

Very carefully. 1. Loosen the wheel nuts slightly. 2. Raise the front of the vehicle, and support it with safety stands in a proper location. 3. Remove the wheel nuts and front wheel. 4. Remove the split pin, the castle nut and the washer from the front hub. 5. Drain the transmission fluid before the driveshaft is removed. 6. Using a plastic hammer, make the driveshaft disconnected from the axle hub.
7. Push the axle hub outward and separate the driveshaft from the axle hub. 8. Insert a pry bar between the transaxle case and the tripod joint case, and pry the driveshaft from the transaxle case.
• Be sure to apply the pry bar to the rib of the transaxle case. • Do not insert the pry bar too deeply, as this may cause damage to the oil seal. [max. depth : 7 mm (0.28 in.)] • For automatic transaxle equipped vehicles, insert a pry bar into the groove of the driveshaft to remove the driveshaft from the transaxle. • Do not pull on the driveshaft; the joints may come apart. Be sure to use the pry bar. 9. Pull out the driveshaft from the transaxle case. • Place a plug in the hole of the transaxle case to prevent contamination • Support the driveshaft properly. • Replace the circlip each time the driveshaft is removed from the transaxle case.

1. Before servicing the vehicle, refer to the Precautions section.
2. Drain the transaxle fluid.
3. Remove or disconnect the following:
   
   Negative battery cable. On vehicles equipped with an air bag, wait at least 90 seconds before proceeding Battery Air cleaner assembly Throttle cable from the throttle body Cruise control actuator cover and connector, if equipped Ground wire Starter Speed sensor connectors, direct clutch speed sensor, and the park/neutral position switch connector on the transaxle Solenoid connector on the transaxle Shift control cable Oil cooler hoses Front side transaxle mounting bolts Front engine mounting bolts Oil cooler line mounting bolts from the front frame Upper transaxle to engine mounting bolts
   
   Fig. Tie the steering rack to the engine support fixture components, as shown-Avalon and Camry
   Front exhaust pipe Engine side covers and undercovers Both halfshafts Front side engine mounting nut Rear side engine mounting bolts (remove hole plugs) Left side transaxle mounting bolts Steering gear housing Front frame assembly Rear end plate mounting bolts Torque converter cover Torque converter retaining bolts Remaining transaxle mounting bolts Transaxle
   

The trans don't have a dipstick, they have to be checked at a dealership with a vag tool, they have to be checked at a certian temperature of operation, as far as fluid i would use the audi recommended G-052-162-A2 atf fluid required