Manual transaxle through 1992 use SAE 80W hypoid oil, API service GL-4, Mil-L-2105. 1993-99 transaxles are equipped from the manufacturer with SAE 75W90 synthetic oil. Volkswagen does not specify a maintenance interval for manual transaxle oil. If the transmission has been abused or used most of its life for towing, an oil change may be in order.
Even if you choose not to change the oil in your vehicle's manual transaxle, it is important to make sure the level is correct. A low oil level indicates leakage, and an over-full level may indicate excessive condensation/moisture in the oil.
- Raise and safely support the front of the vehicle on jackstands.
- Position a drain container under the oil filler plug.
- Using a 17mm Allen® wrench, remove the oil filler plug. If the transmission is over-full, allow the oil to drain from the filler plug opening until it stops.
- Make sure the fluid level is even with the edge of the hole. If the level is low, add oil as required.
- Install and tighten the plug.
DRAIN AND REFILL
- Raise and safely support the front of the car on jackstands.
- Slide drain pan under the transaxle.
- Using a 17mm Allen® wrench, remove the oil filler plug.
- Using the same wrench, loosen the drain plug until it can be turned by hand.
- While pushing in on the drain plug, turn it counterclockwise until it is free of the threads on the transaxle case. Then, quickly pull the drain plug away, and allow the oil to drain into the pan.
- When the oil has been completely drained, install the drain plug. Tighten to 18 ft. lbs.
- Refill the gearbox (using the proper type and viscosity of gear oil) up to the level of the filler plug, until a small amount of oil drips from the threads.
- Install and tighten the filler plug to 18 ft. lbs.