Why do people who drive diesel trucks let them idle?

I have never owned a diesel and I know they have glow plugs and need to warm up longer than a regular car, but is it really necessary (or even beneficial) to leave them running while parked. I regularly see these trucks idling outside of convenience stores and other businesses while the owner is inside.

I also see people start their trucks and let them idle for ages while they load them up.

One Response to Why do people who drive diesel trucks let them idle?

  1. SLS T January 17, 2010 at 10:03 pm #

    Diesel Trucks have a turbo which is oil cooled, if the driver runs the vehicle for a period of time and shuts the engine down without idling the engine for a period of 3 to 5 minutes it won’t be long before they will have to change the turbo. This is very costly. Also if a driver lets the engine idle for a long period of time this will also damage the engine and also become a environmental problem. Most newer trucks have a engine idle shutdown installed, this automatically shuts the engine down after idling for 5 minutes

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