I just bought this car about a week ago and have run about 4 tanks of as through it and I've noticed that the coolant overflow has dropped over that time, I didn't record where it originally was but it's almost to the low mark right now. Upon inspection it kind of looks dirty in the overflow but the radiator appears to be full and there is no overheating. I checked the oil it looks 100% fine and I haven't smelled any coolant off the tailpipe but I do remember smelling some coolant by the engine bay a couple times after being ran for a while. Hopefully it's not a head gasket or anything especially after dumping all this money to buy it! Any help would be appreciated.