Burning oil

Yes, get the rings wet with Seafoam and let them soak for a couple weeks, that is the trick.

One gas inline 4 cylinder IH farm tractor we did, poured Seafoam on top of the pistons. Left the drain plug out with an oil pan inder the engine. Let that one sit for a month.

The desolved black carbon that dripped down out of it into the pan was just like Carbon Black Paint.

So you know the seafoam was breaking down the carbon buildup around the rings and running down into the pan.