My two cents,

30 years ago I went to buy a '62 Amazon that had been, without any prep, been rolled into a dry garage and sat covered and unmoved for 15 years.

I drained the old "gas", put in a battery, squirted Marvel Mystery in the cylinders, cranked for 30 seconds with coil disconnected, and started her right up...
Brake fluid infusion, some modern air in the (unworn original) tires, and I drove it 5 hours home without incident.
Today, 63K miles on that motor, zero work, it runs as well as any B18/20 I've had...

All my other experiences with these motors say if it will turn reasonably easily at the crank, most all the above is just ritualized gesticulation...

And I think olive oil would have worked just as well as MMO

Good luck,
Michael