My neighbor Richard had a very nice '90 W124 300E until about a month ago, when he attempted to remove most of the sheet-metal on one side of the car with a utility-pole.
So he acquired a nice, straight, solid-body '92 300E replacement with serious issues. The '92 engine has a serious oil-leak and apparently has been run low on oil numerous times, until now after warm-up, the oil-gauge struggles to reach maximum unless it's revving 3000 rpm or better.
The other problem is the '92 car was towed about 200 miles with the rear-wheels on the pavement. Richard claims the tranny seems to be working OK but he's barely driven it since he got the car home. So now the questions are (If anyone here would be kind enough to provide an answer, opinion, or point me in the right direction) Is the tranny also toast? And will the good engine & tranny from Richards wrecked '90 300E, easily swap into his '92. Or will there be serious compatibility issues with wiring, plumbing, sensors, emissions equipment and/or computers?
Both engines are the M103 3.0. I don't know what part# the two automatic trannys are.
Thanks in advance.

Happy Motoring, Mark

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DrDKW