Many engines tend to lurch and hesitate when the accelerator is rapidly depressed.
The reason for this is that there is a lot of metal to metal drag under high shock or high stress conditions. Tufoil cuts this way down. One of the standard tests we use on our own test cars is to floor the pedal when the engine is cold, just after starting in the morning. The effects of Tufoil show dramatically on this test. It should be used in the same manner as automotive engines.