underneath the car on the sump near the bottom facing the rear of the car
The sump nut is on the sump or oil pan of your VW. if you jack up your car and climb underneath it from the front you'll see the sump nut on the lowest point of the engine pointing towards the back of the car and slightly down. Don't undo the sump nut/ plug with the engine warm/hot, the oil in the sump will also be hot and can scold you.
Under the car you open a plate that covers the oil sump it has to bolts on each end ,then on the sump you will find a bolt in the middle of the sump unscrew it then you are home .
On a UK car while standing in an inspection pit looking up the sump is under the drivers side of car, the transmission sump if its an Automatic A210 would be the Black panel or plate on the passenger side, its next to the bracket for the exhaust.
There are a few gaskets on a car:- Cylinder Head, Water Pump, Inlet Manifold, Exhaust Manifold, Sump Cover,Thermostat Housing,Transmission Sump,Tappet Cover,Valley cover,Side Cover,Sump Plug,Differential Sump Plug, Transmission Sump Plug, Oil Filter, Oil Pump,Fuel Pump, I'm sure there are more but these will get you started Also door gaskets and window gaskets.
at the back of the sump, but first you must remove the car under tray, approx 8 torx screws
Easy, put the car on ramps. Remove the sump guard plasctics. Drain the oil from the sump. Disconnect the oil level sensor wires. Undo the 3 bolts on the bell-housing that holds unto the sump, you will need a 5mm ball-end allen socket. Undo the 20, 10mm head bolts on the sump bottom. Remove the sump, you may need to tap with a soft-head hammer. This is one of the easiest sumps to remove with the engine in the car.
Jack the front of your car up and put it on axle stands, drain the oil, then undo all the bolts around the top of the sump.
On the sump which can be accessed by jacking up the front of the car. climb underneath after securing the vehicle in a raised position and the sump plug will be on the lowest point of the engine pointing towards the back of the car and slightly down.
To collect metal shavings that might be floating around.
All the oil sump plug are on the lower part of the engine, in this case is the same, but you probably will no notice that because it is not a common plug, this car have a square plug.
Out of car method. Remove the head and sump Undo the con rods from the crank, then slide the con rod & piston out. In car method. Drain the coolant Remove the cylinder head(s) Raise the car. Drain the oil Remove the sump. Undo the con rods from the crank. Push up the piston and con rod assembly. On some vehicles it is not possible to remove the sump in situation. A good home workshop manual will be a real help in doing this job.