Truck Repair: Ford Powerstroke Diesel, ford powerstroke diesel, tractor trailer trucks

Question
I recently purchased a 2004 F-250 Superduty Crewcab with Ford's Powerstroke Diesel.  We just now hit 8500 miles.  I've been driving vehicles for 34 years and this is my first diesel truck.  We live in NE Oklahoma

Over the years I've noticed that diesel truck owners tend to let their engines run as much as possible.  I especially see this as they stop at my local Convenience store or buying feed or out doing errands.  I've noticed it with semi's on the interstates for years.

I'm aware of the principle that in general an engine may last longer if it is running coninuously as opposed to many start/stop cycles.  Does the continuous running of today's modern diesels serve a useful purpose? Or conversely, do frequent start/stop (errands) cause any undue shortening of engine life or components?

Thanks for any explanation you can provide.
Bob VR

Answer
The main reason you see Tractor/trailer trucks running continuously is because they hold 12+ gallons of coolant.  They cool down quick, and warm up slow, and with 150-300 gallons of fuel, using a few to keep it warm is minimal cost.
As far as using your pick-up for start/stop in town stuff, yes it causes wear, but at what point do you draw the line???? it really is up to the owner.  Personally I would try to avoid starting the truck 30 times a day, but normal use is normal use.
The key to a happy diesel is, keep the oil changes on a regular basis, and WORK the truck.  A diesel is built to pull; they love to pull and it is good to get it out there and blow the cob webs out of it.
Hope this helps, if you have any further questions feel free to ask.