I go to the same place! I recently had my car in for other reasons, and asked them to look at it my water, which they had changed out a few months earlier. I mentioned that when I'd changed my own thermostat -- my fluid was decidedly green -- not the color I'd expect from MB fluid. They drained it, flushed with plain water and replaced with MB mix. They charged me no labor. The service writers at that location are top notch.

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David
1986 300E Anthracite + ECodes + MB Mileage Award