Today on the way home from work my car started smoking a lot. It smoked the most when I shifted. I just got a new radiator and switched to 30SAE oil because I was told if I had bad valve seals this would stop the smoking. The smoking had stopped for a few days and now this. It smells like oil when I'm driving, but when I get out of the car after shutting it off it smells like coolant, also it has started to leak oil. Is this a bad head gasket? If so, will I be able to replace it myself?
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