The is a WIS procedure for ATF in the coolant. Essentially, the recommendations are to replace the radiator, flush the system with special MB 'degreaser' (PM me if you want the part no.) and maybe add a dedicated transmission fluid cooler.

I just recalled that MB made a change (~W211). In the W210 the coolant is scheduled for flush every 3 years. In newer models the coolant is scheduled for flush every 15 years! The newer radiators have a built in chemical pack to help prevent corrosion.

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Good luck.






1998 E320 Wagon