[bigbrotherjohn]

At what point should a newly rebuilt engine stop smoking, oil smoke. After my first few miles prior to initial run in the smoke completely stopped, now after about 120 miles it is back.
The smoke is not terrible but is very noticable. It came on after one of the longer runs that ive had the car on and was about a half quart low on oil, i didnt think that should be a huge deal. I am using straight weight 30W oil, non-detergent, not sure if it matters but it is pretty warm here now in the summer, 80's to 90's.
I am assuming that the smoke is from oil coming past the rings, or possible valve stem seals? Is this something that i should be worried about? Right now my plan is to change the oil and filter and keep driving normally hope for the best.