I purchased one gallon of MB anti-freeze from my smart dealer parts department last week and after getting home I noticed the anti-freeze color was yellow and the fluid in the smart is blue. I sent an email to the service manager about this and he said I got the correct anti-freeze but couldn't tell me if it was ok to mix the two. I would think someone in his position would know. Has anyone used the yellow MB anti-freeze to top off their blue coolant?
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2010 Smart 
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