Hello,

Here is an old trick from my hot rod days. Take your vehicle out to a highway or a road to get the car up to 60-70MPH, then take your foot off the gas and let the car coast for about 10-15 seconds, then give it a lot of gas. If you have a problem with rings or better yet, valve seals, you will get a pretty good puff or cloud of smoke. When you take your foot off the gas the engine goes into high vacuum and will collect oil in the combustion chamber.
Best of luck!