I am a career firefighter. I was driving my 2002 Jeep Wrangler X home from work the other morning when the jeep overheated and shut off on me. When I was driving it, I noticed it had a loss of power. I open the hood and the radiator had an obvious crack in it. The radiator was replaced but the jeep still does not run right. The oil is milky, and the jeep blows white smoke out even after it runs and heats up. Could this be a cracked head/engine block or a head gasket?. I do not know much about engines so any help is appreciated...