Originally Posted by PWGuy
Wow, I'm surprised by this to say the least. Ok so let me ask a different way - is it better for the engine internals, etc to warm-up the engine while parked in my driveway 10 minutes before a super short trip, like my wife driving to work? (Putting MPG aside)..
Believe it or not (grin), it's actually better for the engine to warm up under light loads than to idle until warm.
Best way I can describe this, is that without any "load" on the engine, the moving parts tend to "flop around" more - creating stresses that aren't there in normal use.
Long times spent "idling" actually wear an engine MORE than normal highway driving for example, one of the many reasons "idle reduction technology" is a major issue regarding "Big Rigs" these days (Saving fuel & reducing emissions are the items in the news, but it does reduce maintenance & result in better longevity as well)