Sup guys so I'm running a B20B engine with a P8R12 head and S80 transmission. i haven't done anything to the car, i bought it with the swap and just recently had this problem. oil is mixing in with coolant in both the reservoir and the radiator. The car boggles and then shuts off. it won't stay on, since this happened and i seen the oil in the radiator i stopped driving cuz i was scared i was gonna blow my engine, i think i just need to replace the head gasket but idk how to do it sum1 please advise and help. Thanks