Run Seafoam in the oil, and drive it, with 170 compression the rings
are good, but you are having oil control or scraper ring issues, probably
due to old oil just sitting in the engine.
I have seen "good" brand oil do some crappy stuff, and I would never
buy and use that oil ever again, you might change the oil and add the stuff
or just add the stuff and drive it, see what happens, this worked for another
ZW board member, and he's now a happy camper....Er Zuker lol
Wild