i have been avoiding opening up my motor to do the valve stem seals til im ready for some internals[cams springs etc]. the car has only 46 k miles on it and its a 93.5 . some have told me nothing will harm it itll just be annoying smoke on start up and at redlights. others say the valve will have too much play in it over time and will require more than just a seal change. also i hear i loss power and oil is blown by and gettin in places it shouldnt. so what the truth on these rumors?