Thanks for that. If they will not soak loose one way or another I have been toying with an engineers ideal to blast them loose. All other easy possibilities should be exhausted first.
I do not really have a firm opinion if they would just loosen up over time by driving. Somehow I suspect not.
Also I do not know if coke deposits are hard enough to score the walls.I suspect not. I really like the possibility of the marvel oil softening or dissolving the deposits first if possible.
You might wish to turn the crank 1/4 turn every other day. A better chance of soaking the compression rings on all the pistons. The pistons near the top of the bores possibly have the rings at their greatest distance from the walls because of the cylinder taper.
The other thought is the position is irrelevant. The rings cannot rock a little to allow sealing because they are glued in with coke. If your car is outside remember chemical activity really slows at low temperatures to almost nothing so try to be patient.
I might take an old coke coated glow plug and stand it in a small cap of the miracle oil to check periodically how much effect it is having on the coke. The burnt out plugs might be ideal for this. You cannot see inside the engine. . I would do two separate old glow plugs that way. One I would leave outside to duplicate the rate of penatration of the coke by the oil and the results. The second one I would keep in the house as the increased chemical action at elevated temperatures will show the end result of the miracle oil in the engine well in advance. Plus provide a baseline for what the oil can achieve.
This whole thing should be interesting. I will also try to find out how other people have dealt with this problem if they have at all over the next few days.