yes that is what oil stem seals are if the car smokes when at temp and idle it will be the piston rings most probs or if it smokes heavily on boost its turbo oil seals which are knackered.or if it is from just idling and it clears as you take off it is the oil seals.
I disagree. If it's smoking constantly, then it's going to be the rings, but by this point it will be pretty bad, and breathing really heavy.
If it's smoking on idle when warm, particulary if it's not instat when u let off, then thats turbo. Worn stem seals tend to be after u come back on power after over run