After inspecting the parts, check for signs of leakage. Remove the filler plug and check the oil level. If contaminated, the oil must be changed. Use SAE 75W/85W halide gear oil (AFI-GL 4).
1. Having installed the car on a level ground, removing the drain plug, drain the gear oil.
2. Replace the gasket with a new one and install the drain plug in its place.
3. Fill in new oil through the filling hole to a level 5-9 mm below the hole (total capacity: 2.15 l).