2010 c300 brown coolant
I just bought 2010 c300 and the tempature gauge is
above half also the coolant is brown and oily. Why ?
Oil might be mixing with the coolant, so a potential headgasket issue. You'll have to have a mechanic look it over for you, or have the shop you bought it from fix it, if you got a warranty.
Or the previous owner may have put some kind of stop leak junk in the cooling system to "fix" a leaking radiator or other cooling system component. HTH. -Jim
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