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Here's some info on Differential oil Change: In addition, do a search too, and check the 700/900 Faq's for more info. Sorry for no pics. I'm not that sophisticated yet. I'm told there are fluid pumps and other gadgets to make this job easy and mess free. Here's my way, which from start to finish, took about 1 hour.
1. Drive the car enough to get the car nicely warmed up. I would guess a 5 - 10 mile run. You need to jack the car so it's relatively horizontal. I used ramps in the rear, jackstands in front. Be careful!
2. Remove the fill plug first. This is to make sure that after draining, problems don't develop with removal of the fill plug to make the job impossible. After removal of the fill plug remove the drain plug which was provided on my 90 244 (which had a nice magnetic tip, too). On my 93, no drain plug is provided, so remove the bottom case bolt, which will allow draining. Be patient to let the case drain fully.
3. I used 75/140 wt. gear oil for the 90 244 that cost $ 2.50 per quart Rated G-5(picked up two quarts, cause the capacity is 1.7 liters - about 1.8 quarts). I also purchased 8 feet of 3/8 tubing ($.23 per foot) and used that to deliver the oil into the case. You can snip the first 1/4 inch of the dispenser top, heat the tubing and slip it completely onto the dispenser top. Although it seems to fit well, there's no real security here when you turn the bottle upside down, so if you have a helper (wear latex gloves), they can make sure the tubing and top stay put. In addition, you can just duct tape the tubing in place under the car somewhere after inserting into the fill hole. To get the heavy oil flowing, with the helper holding the jug, I put a pinhole in the bottom and followed up by inserting a ball pump pin hooked to the bicycle pump. If I sized the hole fairly well, I could pressurize the jug and force the oil through the tube at a fairly decent rate. If you let it go by gravity, or by squeezing the jug, you'll be there for half a day. Just remember that your helper needs to maintain his hold onto the tubing/jug so you don't make a mess. I just could not figure out a better way to connect tubing to dispenser top. I even tried a hose clamp and zip tie, both NG. By the time we got to the second car, however, we were pretty good at not spilling any oil! For the 93 244, I used Valvoline syn blend 80/90, also rated G-5 which cost about $5 per quart.
4. When you get to about 1-1/2 quarts, start slowing up cause the case will be filled soon. You'll know when the case is filled because oil will start dribbling out of the fill hole.
5. I used a little non-drying gasket cement on the fill and drain plug threads at the top of the shank to finish off the job.
Marty Wolfson
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90 244 216K, 93 244 167K, 93 244 109K, 99 V-70 73K
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