- connection of the cylinder block with the gearbox (flywheel/gearbox drive shaft seal);
- threaded oil filler and drain plugs.
Half shafts to the gearbox
When searching for leaks, do the following:
- clean the gearbox housing with a cold cleaner;
- check the oil level, top up if necessary;
- apply lime or talc to possible leak sites;
- make a test drive to make the oil liquid. To do this, drive about 30 km along the motorway;
- then place the car on jack stands and inspect the gearbox leak areas with a flashlight;
- eliminate leaks.
Attention! If the gearbox is dry, there is no need to check the oil level. However, if the oil is leaking, the level must be checked.
The original text can be found at (VWMANUAL.ru)
Checking the oil level in a manual transmission
1. Place the machine horizontally on trestles.
2. Unscrew the oil filler plug with a 17 mm spanner. It is located on the front side of the box under the starter.
3. If a small amount of oil flows out when you unscrew the plug, then the oil level is normal. Otherwise, check with your finger: does the oil level reach the bottom edge of the filler hole. If not, add hypoid oil. This requires an oil syringe. When adding oil, place a container underneath to collect the leaking oil. Do not pour in too much oil at once.
4. Hypoid oil specification – GL 4 SAE 80 or synthetic oil G 50 SAE 75 W-90. Filling quantity: 3.0 l.
Attention! Be careful not to add too much oil, but only up to the bottom edge of the filler hole.
5. Tighten the oil filler plug and remove the machine from the jacks.

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