Hi,
That is a good indicator that the rings are worn. It could be a combination of valves or even a gasket, but the idea that it increased 25% with the oil, the rings are an issue.
As far as the restore, I've never used it, but it can't hurt. I'm a lot like you as far as additives are concerned, but considering the circumstances, why not?
Let me know if you try it and how it works.
Joe
Wednesday, August 3rd, 2022 AT 7:04 PM