OM61X engines have the iron head AND block.
OM60X engines have the iron block and aluminum head.

After recently experiencing firsthand the effects of coolant neglect on my 71 250C (Fe block, Al head), I'd be reticent to use anything other than MB coolant in a OM60X. Thanks a bunch PO.....

I make it a point to use MB coolant in all my Fe/Al car's engines, and for good measure, I use it in the 83 300D as well.

Much cheaper than having to have the head rebuilt because of missing material due to galvanic corrosion.....

If you are anal about frequent coolant flushes, you *might* get away with green coolant, but the cost factor advantage goes away with frquency, so might as well use the right stuff......

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles