Every 38,000 km or every two years.
1. Before starting work, let the vehicle drive for a few kilometers to warm up the differential fluid, then jack up the vehicle and place it securely on axle stands.
2. Place the drain container, rags. Newspapers and socket wrench under the car. Since the lubricant will be hot, wear rubber gloves to prevent burns.
3. Remove the filler cap from the differential; this is the top of the two plugs.
4. With a drain pan under the differential, loosen the drain plug; this is the lower of the two plugs.
5. Carefully unscrew the drain plug until it is removed from the casing.
6. Allow all liquid to drain into the drain pan, then install the drain plug and tighten securely.
7. Read the instructions in Section Checking the differential fluid level and fill the differential with lubricant.
8. Install the fill plug and tighten it securely.
9. Lower the vehicle to the ground. After driving the first few kilometers, check if the drain plug is leaking.