My bike has 15 hours on a fresh top end. Everything was running fine until during a muddy ride last weekend I overheated a couple times, and the bike was very difficult to start hot. After the ride had to replenish about half the coolant (Engine Ice). Did a search and found if coolant is bubbling at the radiator opening with the cap off while the bike's running it's got a blown head gasket. So my question is wouldn't the oil and coolant mix and give me a milkshake like oil? It does not have this.