Just a little smoke.
Well the thing is due for a rebuild but until then,
you can run the car then while HOT pour in stp oil treatment, that is about the only thing that MAY help. But on valves and rings leaking there is no for sure remedyWhat is the best oil additive for bad valve seals?
Once upon a time I used a quart of Motor Honey, worked great, I don't like STP.