my sportif is smoking in mo9ring for about 5 mins them stops its, also happens if left for about 3hrs,, its white smoke sure ive seen tint of blue here and there,,, coolent levals dont drop oil still fresh,,, this moring rubbed my finger in back box and damp oil on my hand also smells like oil,, got a feeling prob valve stem seals,, how much to repair cuz dont want to try that my self,,,, any other ideas what it could be,