I am seriously hoping you dont have coolant in the transmission. It is a widely known issue. Replace the radiator immediately if it is original.

I replaced mine with a new Nissens as soon as we bought the car. No way am I risking the transmission from blowing up for $170. I also had blackstone labs oil test the transmission fluid for coolant to be safe and it came up OK so I got lucky but there are plenty of nightmare stories with the stock Valeo radiator during that time frame and MB never admitted to fault about it. I would highly suggest you replace the radiator regardless.

And for what its worth, 0-40 Mobil1 is the correct oil for the M112 if you have the FSS...I dont believe that oil is approved by MB.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k