I stopped idling my diesel trucks before work. Here's what happened.
A lot of mechanics tell you to let diesel engines idle to warm up, but I disagree. I used to do it for years, but two years ago I quit that habit. Now I start the truck and drive off slow after about a minute. With my ten trucks, I've seen no extra repairs over 50,000 miles each. We actually cut fuel use by a good amount. Some say this hurts the engine, but my experience shows it's fine for modern diesels.