I bought a 52 5 window chevy pickup that had sat for over 5 years in a field with the breather off and the rocker cover off. It was seized. I filled the motor full diesel fuel, until I couldnt another drop in it. After about a week I could turn it with a wrench. Left it sitting another week but turned it over everyday and stoped it in a new location. The following week i drained all the fluid out of the motor. Couldnt believe what came out. Filled it with new oil and fresh gas, put the rocker cover on and it started. Blue smoke everywhere but in a matter of a couple of minutes it was running clean. The diesel fuel had unseized the pistons, rings, and what every else was seized. Ran it for about 1/2 and hour and change the oil again and it was good to go. Drove it for about 4 years and then sold it. Never had a problem with the motor.
Seems to me that diesel fuel works good.