Growing up, I've heard different people say some engines like to be "worked"(not lugged), as in they like to pull a load rather than just cruise along. I've heard this typically of big blocks. These people claim the engines won't last long if they have an easy life. Have any of you heard this and can confirm or deny the story first hand? I suspect the only way one would know would be to have the same engine run in 2 different vehicles with one an easy life and the other working and compare the life span of them.