The "Caccolube" was a simple but effective device to disable an enemy vehicle. It was a condom filled with abrasive powders and crushed walnuts, and was dropped into an engine crankcase. "After the engine heats up," the OSS manual explained, "the hot oil will deteriorate the rubber sac and free the compound into the lubricating system.
"When circulated through this system, the compound fuses and welds the moving metal parts of the machinery. Slipped into a truck, the Caccolube takes effect after the truck has been driven from 30 to 50 miles. It reacts so thoroughly on pistons, cylinder walls and bearing journals that the vehicle is not only thrown out of service but the engine is destroyed beyond repair."
This lethal "lube job" replaced the original effort using sugar, when it was discovered that sugar actually promoted better engine performance in the vehicles of that era.
Source: Jack Anderson, "Rare arsenal used by spies," Santa Cruz Sentinel, Mar 9, 1987.

"I trust him with my life driving the tractor. He can hold it on a hill and keep it from slowing down. You should see him holding that wheel as he skirts the hill and I work behind.

We take it in turns to drive and toss off the hay to the sheep and cattle."