Durability depends upon items not breaking or needing replacement. A cummins (6bt-like the ones in Dodge trucks) are of an inline design which by the nature of the beast has fewer parts-ie 6 pistons...
how to get super powers on super power island[submitted by Kenny Chen]:
first defeat all the villains except Betty Jetty. Then the phone will ring and go and answer it. Then, cool patterns should go...