My invoice shows a charge of $20 for 2 gallons of (green)coolant. The last time I bought MB coolant it was $12 per gallon. It sure looks to me the dealer is trying shave costs on "older" MBs.
I will contact the dealer to resolve this in the next few days. Any advise on what the best approach is when going back to a dealer to fix this sort of thing? A complete flush, citric treatment and refill with correct coolant sounds very reasonable to me. Advice?