WG 2.7 CRD
auto service as a DIY
job isn't all that hard but if you don't have a hoist or BIG ramps I'd leave it to the Tranny Shop, you can make a hell of a mess.
You will need at least 5 lts of oil MB 001 989 21 03 you can also use Shell SPIRAX S4 ATF 3403 but I haven't been able to find any, that will set you back about $160, a filter MB 1402770095 S1 from $47, better to buy from a MB dealer/supplier as they usually have them in stock and are cheaper, but make sure it has the gasket.
I know its not the correct way but I used some heavy gage cable to mark the oil level before the job, then filled it to the same level.
A set of Torx drivers to remove the pan and a tray about the size of a large esky lid to catch the oil, the filter just needs a firm downward pull to remove, you should also notice a small black grate thing in the pan, it's not a loose part it is a magnet to catch any stray bits.
Once youv'e cleaned the pan up, fitted the new gasket and filter, refit the pan, making sure the gasket stays in place. When filling the oil I used one of those pourers from another 1 lt oil bottle, fitted it to the MB bottle a poured it down the dip tube, a hole drilled in the base makes it run quicker, checked the level with my wire dip stick, gave it a run then after it settled checked it again and added some more, if needed.
Should be about 5lts.
I change mine about every 30-40,000Km, the manual says at 100,000K but that may be too late to show a minor problem, now mines at 140,000k and running sweet still.
The Auto in the WG 2.7 CRD is a W5J400 ( a Mercedes Benz W5A580) 722.6
I think I've covered it all, if I've missed anything someone is sure to let me know.
Updated info on oil types located below link