Upon cold start up and higher rpm running until operating temp reached, I have a grey/blue smoke from the exhaust. The guy I used to work with did a head gasket replacement on it but said the valve seals didn't "feel" bad so he didn't change them. Sound like the problem to anyone? How hard is it do just change the seals? Sweet squirrel stew!! Oh yea, it is using up the oil pretty quickly or I would not be too concerned. I would say easily a quart per 1k miles.