This would be a 722.4 transmission. Use the Mobil1 only if it says it meets specs for DexronIII/Mercon. Mercedes doesn't sell ATF for this one, just the newer 722.6 transmissions.

It would be a pain to do this job on the ground, be better off doing it on a hoist, otherwise it can really make a mess of the driveway or garage.

There is a drain plug on the trans pan and the torque converter, you need to be able to rotate the engine to get the torque converter drain plug facing downwards. There is an aluminu drain plug seal on the torque converter and a copper one on the pan drain plug, both should be replaced.

You'll need about 7 ot 8 quarts of ATF to fill it after the job. Pour in 3 quarts, then start the engine and put in the rest of it. I'd put in 6 total to start with (the initial 3, plus another 3 after starting), then check the level.

Gilly