I would like to replace the valve seals since I get tired of fumigating the cars behind me when I accelerate from a stoplight. (I believe seals to be the cause due to high oil consumption, plus some google fact finding.) How involved/difficult is valve seal replacement? I am sorry to say that my mechanical experience is far behind that of the rest of you gentlemen. Engine currently has 219,000. I should probably replace the head gasket while I am at it too huh?