It is recommended to change the oil in the gearboxes of the front and rear axles every 45 thousand km. But these are factory recommendations
If during the operation of the car, you decently loaded the car and had to drive on bad roads, then it is advisable to diagnose the bridge and fill in fresh oil after 30,000 km.
It is advisable to drain the oil after a trip, since the oil used in the front and rear axles has a high viscosity.
And before pouring oil into the gearbox in the autumn and winter periods, it must be heated to increase the fluidity of the oil. But at the same time, do not bring the oil to a boil.
The hole for the filler plug of the gearboxes is also an oil level control hole, therefore, for more accurate oil filling, the car must be installed on a horizontal surface before filling the oil.
When draining the oil, you need to inspect the sediment for the presence of metal chips (you can do this with a magnet).
Each time you raise the car, try to clean the breather of the gearboxes.
Rear axle oil change
Remove the drain plug
Drain the oil.
Replace and tighten the drain plug.
Remove the fill plug
Fill in fresh oil using a syringe to the level of the lower edge of the filler hole.
Replace and tighten the filler plug.
Changing the oil in the front axle gearbox
Remove the drain plug
Drain the oil into a container.
Replace the drain plug.
Remove the fill plug
Fill in fresh oil using a syringe to the level of the lower edge of the filler hole.
Replace the filler plug.
1.15 liters of oil are poured into the front axle housing
1.3 liters of oil are poured into the rear axle housing
Gear oils with a quality level according to API GL5 or universal GL4 / GL5 with a viscosity of 75W-90, 80W-90, 85W-90