I would agree that you should get the Dexcool
completely out of there. And I emphasized
completely, because Dexcool OAT coolant does not mix with conventional coolant or HOAT coolants. It can precipitate a sludge! Not sure how that would be done by shop, but seems to me you need to drain block and rad, then flush thoroughly with water, then drain again before adding either conventional coolant (the green stuff), but read lable to make sure it says it is good for aluminum. That will have a relatively short life before needing a flush to restore additives. Better to filll with 50/50 HOAT which is what MB coolant and Zerex GO5 are.
This site provides a concise comparison of the three main coolant types:
Antifreeze Facts
This site says:
Quote:
8. What happens if you mix conventional Antifreeze with Extended Life antifreeze?
Extended Life (OAT) antifreeze is NOT compatible with conventional (IAT) antifreeze. Aside from discoloration of antifreeze when the two are mixed together, a chemical reaction is caused when the carboxylate salts are mixed with the inorganic salts and caustics found in conventional antifreeze. If they are mixed, the antifreeze can become cloudy, precipitation can generate and the coolant will lose it’s extended life properties.
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5