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Originally Posted by bill murrow
My car ['85 300td] has a cast iron head and I can see no reason why the green can't be used. I think the "orange" MB stuff is just the environmentally safe stuff and that is the only difference....
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Your MB shop is mistaken. The MB antifreeze is not environmentally safe, only propylene glycol is. MB antifreeze is not propylene glycol. Like most antifreezes, it's made of etylene glycol.
More than the head material is considered when choosing the proper antifreeze formulation. You have to consider the radiator, heater core, and rubber hoses. Some have reported that using the wrong antifreeze can be hard on the hoses.