I have a 2015 dodge journey 2.4 engine 4 cylinders, it has almost 173,000 miles.i have had my transmission rebuilt, thermostat housing, valve gasket cover, and radiator replaced this year. I was told I have a blown head gasket.I forgot to mention mechanic did put blue devil head gasket sealer. Recently it has started overheating again and I have been having a lot of misfiring issues (lots of spark plug changes) oil is getting into the cylinders. I inspected cover gasket and it seems to be ok so why would oil be able to get to cylinders if cover gasket is fine? I did flush and put more blue devil to stop the overheating which it did but oil is still getting into cylinder.Any help is appreciated