Excessive idle does NOT hurt the older emissions diesel engines. I call BS, no matter what any article says. real world to me, of which I have alot, shows me that "well oiled machine" applies to the older diesels (7.3, 5.9 Cummins, etc). As long as they are maintained well, engines with high idle hours do not affect longevity of said motor. Ask the guys, like myself, who have very high mileage engines that run impeccably. Throw an EGR or DPF on there, different story. One of the BEST running 7.3s I owned came off of a drill rig company that idled and ran from 6am to 8pm at night, every day, for a few years. I bought it, drove it for another 3 years and 100k miles and then sold it to a buddy. It still is running very well, no new injectors, no engine rebuilds, nothing. Just oil changes, a clutch, good maintenance, and keeps on trucking. The ones that are "weekend warriors" or have been "babied" will make me runt he other way as fast as I can go. been there, done that.