I'm going to give you something to think about. When trying to free up a stuck engine, you want penetrants. Not oil. Oils will not dissolve, they will lubricate. Use penetrants on valves, pistons, timing chains, rods and crank shafts, nuts and bolts that are rusted or stuck. Not oil.
Marvel mystery oil ....is oil. tranny fluid is oil, power steering fluid is oil.
WD-40 is a penetrant (sort of), KROIL is the best penetrant I have found and used. PB Blaster is a penetrant. etc. etc.
Here is a test I did for penetrants a few years back. Read this;
https://www.stovebolt.com/ubbthread...l&topic=0&Search=true#Post215167
