Locate the differential drain bolt. Loosen and remove. Step 2: Allow time for the gear oil to completely drain. Replace the drain bolt. Wipe any excess gear oil from the case.
Step 3: Locate and remove the gear oil fill bolt. Step 4: Use a pump to slowly add the recommended type of gear oil to the differential. Step 5: Add the recommended amount of gear oil to the differential, or until gear oil starts to dribble out of the fill hole. Step 6: Reinstall and tighten the fill hole bolt. Wipe off any excess gear oil from the case.
Either way, changing the differential fluid in your car is very important, so you can rest assured that your mechanic is not trying to run up your maintenance bill. What is a differential? YourMechanic Auto Repair.
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Tyrone 19 years of experience. In either case, you'll need a wide catch pan; a plastic dropcloth beneath that would be good insurance.
Drive your vehicle for a few minutes to warm the oil, then change into your grungy clothes—you'll probably get dirty. It's just changing oil, right? Nothing that complicated, but brace yourself, because old car differential oil has the foulest smell in the automotive world. With that warning, remove the fill-hole plug at the top of the diff casing, then unscrew the drain plug.
If you don't have a drain plug, unscrew the housing bolts, leaving a couple of bolts on top loosely attached to hold the cover in place. Using a standard screwdriver, pry open the cover gently or the oil will gush out and cover you in that unholy stink.
Be careful not to mar the surface of the differential housing. Let the oil drain completely, then remove the cover. Assume that all the leftover oil in the axle is loaded with metal shavings.
If you're an oil-changing Boy Scout, you don't have to worry about this, but the rest of us should take the time to wipe the remaining oil out of the housing, the gears, and the wet side of the housing cover. Make sure to get it all, because there could be some shavings hiding in the nooks and crannies. Once the cover is shiny, run a magnet around the inside to pick up stray metal shavings.
Clean the tip of the fill-hole plug too; most are fitted with a magnet to grab fine metal particles.
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