Had a wreck last week and radiator got punctured. I see where oil has run down my block, looking like it came from the head and now there is some red in it to. I had added some red coolant that we had in the barn, so that means I got oil mixing with my oil correct? Which means I have a blown head gasket correct? I used motor oil in my tranny so its not red so the only thing it could be is the antifreeze. Any suggestions? And if it is blown, how hard is it to change?