Does Marvel Mystery Oil Actually Work? Johnson Engine Part 5

My Johnson has low compression! Let's try both Marvel Mystery Oil and Johnson/Evinrude Engine Tuner to see if they help.

Johnson playlist: https://youtube.com/playlist?list=PLHACLo2Ax7LE8eRt1OyXGyWUxdT9F-cLN

Entire Johnson engine series:
Part 1: https://youtu.be/6F-gDg6zpPg
Part 2: https://youtu.be/GILDY6aKWic
Part 3: https://youtu.be/bpHVxNEyPcA
Part 4: https://youtu.be/3zzBIFZrNu0
Part 5: https://youtu.be/EvHEj7ssbxw
Part 6: https://youtu.be/Qbe-jwLLN-s
Part 7: https://youtu.be/2Cz-O-s3TJs

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Unfortunately with only 1 engine worth of data, there's no way to get a real answer as to whether the products work or not. They might work very well, just not in this case.