So I am driving home on the highway last week and and get high temp warning. I drive a couple miles to the next exit and find that the coolant level is low. I put in some from a gas station and get the car home. I can not find any signs of a leak and checked the thermostat and its all good. I ended up changing the oil and coolant and drove the car around for about 30 minutes and it all seemed good. Next day go out for a 20 minute drive and high temp warning goes on. I stop and check coolant and its down about a half gallon.... I drive it home again and take off oil fill cap and I see water has collected in the cap and foam. I am not seeing any signs of white smoke out the exhaust and cant find any other signs of a leak. This car only has 85K miles has anyone else had issues with head gasket on this car?