Using differential oil, also known as gear oil, involves draining the old fluid and refilling with the correct type to lubricate and protect the differential gears. Here's a step-by-step guide:
Steps to Change Differential Oil
- Prepare the Vehicle:
- Securely lift the vehicle using a jack and support it with jack stands on a level surface. Using ramps may work for some vehicles, but access to the fill and drain plugs may be limited. Safety first! Never work under a vehicle supported only by a jack.
- Locate and Remove the Drain Plug:
- Identify the differential drain plug, typically located at the bottom of the differential housing.
- Place a drain pan underneath to catch the old oil.
- Use the correct wrench or socket to remove the drain plug. Be prepared for the oil to come out quickly.
- Allow Complete Drainage:
- Let the old gear oil drain completely. This may take 20-30 minutes.
- Inspect the drain plug. Some have a magnetic tip to collect metal shavings; clean this off.
- Reinstall the Drain Plug:
- Once drained, clean the drain plug and reinstall it, tightening it to the manufacturer's specified torque. A new crush washer is usually recommended.
- Locate and Remove the Fill Plug:
- Find the differential fill plug. It's usually located on the side of the differential housing.
- Remove the fill plug using the correct wrench or socket. Sometimes these can be difficult to remove due to corrosion, so penetrating oil can help.
- Add New Gear Oil:
- Use a gear oil pump to slowly add the recommended type and quantity of gear oil to the differential through the fill hole. Refer to your vehicle's owner's manual for the correct specification and capacity. Using the wrong type of oil can damage the differential.
- Continue filling until the oil reaches the bottom of the fill hole.
- Reinstall the Fill Plug:
- Once the differential is full, reinstall the fill plug and tighten it to the manufacturer's specified torque.
- Clean Up and Lower the Vehicle:
- Clean any spilled oil from the differential and surrounding areas.
- Carefully lower the vehicle back to the ground.
- Dispose of the old differential oil responsibly. Many auto parts stores will accept used oil for recycling.
Important Considerations:
- Correct Oil Type: Always use the gear oil specified in your vehicle's owner's manual. Common types include 75W-90, 80W-90, and 75W-140. Some differentials require synthetic gear oil.
- Tools: You'll need a wrench or socket set, a drain pan, a gear oil pump, and potentially penetrating oil.
- Safety: Always use jack stands when working under a vehicle.
- Frequency: Check your owner's manual for the recommended differential oil change interval. Generally, it's every 30,000 to 60,000 miles, but this can vary.
By following these steps, you can properly change your differential oil and ensure the longevity of your vehicle's drivetrain.
