My 22RE has been doing this for at least three years. It is the valve stem seals letting oil by them and if you check the oil frequently, should not poresent a real problem. Just keep an eye on the dipstick, or you may as well do a valve job and replace the seals.
Danny


1985 SR5 4Runner
eLocked with Carter Lock
4.7:1 single case
Davez Offroad twin stick