In Reply to: What to do with 8N? posted by Del Huebner on February 19, 2017 at 10:14:51:
Stewart-Warner CD-2 oil detergent, or GM's Engine Oil supplement.
If it was me and I figured the possibility of stuck rings I would be looking at "snake oil" just before an engine rebuild. I know both of those work very nicely to free up noisy lifters. Both of those additives work well with a fresh oil change. Might even work to free up stuck rings, if that is what you have. The batteries in my crystal ball have gone dead, so it doesn't work too well anymore. How's your's working?