Don't assume that your gonna "see it all" in a lifetime, much less in 20-40 yrs. I've had to eat my words before on units I've rebuilt 1000's of! Ever heard of greasy shop rags spontaneously combusting in low humidity?
If I had a dollar everytime and old codger said "I thought I saw it all!", I would be a billionaire!
Ever heard of greasy shop rags spontaneously combusting in low humidity?
This is one I have heard about, I have even heard about people trying to get this to happen on purpose. I suppose the humidity was not low enough, or the ambient temp not high enough, or not enough oily rags used, or oil of poor combustability, because you still hear of this happening from time to time.