the m-119 was plagued by leaks.

you're losing oil from the back of the right valve cover gasket [maybe left side as well], and from both sides of your front timing cover.

also you maybe made a mistake by switching to synthetic oil...it seem to find places to leak that dino never thought.
i'd use the 50w synthetic in the summer months, the 400e's could not dispate heat very well. also 1 of the reasons ALL w124 m-119 wirng harness degrade

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*92 400e 124.034, SOLD

*92 300e 124.030, SOLD