If you Google "diesel idling engine damage" you will find many results. This one from the Canadian government gave a good explanation"
Increased Maintenance Expenses
When a gasoline or diesel engine idles for prolonged periods, the engine oil becomes contaminated more quickly than when the vehicle is being driven. Oil contamination is more prevalent in diesel engines because of the large amount of intake air used in the diesel combustion cycle. When idling at low rpms, such as 600 rpm, the excess air in the combustion process cools the cylinder liners, resulting in incomplete combustion and condensation of unburned fuel on the cylinder walls. These deposits are eventually drawn into the engine sump where they contaminate the engine oil and reduce its effectiveness as a lubricant.
Controlled studies demonstrate that prolonged idling typically reduces the operating life of engine oil by 75 percent, from 600 engine-hours to 150 engine-hours.
Compare the convenience of excessive idling against the cost of more frequent oil and filter changes and the amount of time your truck will be out of service while the work is being done.
Shorter Time Periods Between Engine Rebuilds
Idling produces carbon deposits and unburned fuel residues that will accumulate and damage the engine at several vital points. If you idle your truck excessively, you can expect to pay for more frequent servicing of spark plugs, fuel injectors, valve seats and piston crowns. If you have the option of setting the idle speed on your diesel engine, keep in mind that idling at low rpms (600 rpm) will reduce cylinder pressures and increase the amount of unburned fuel and carbon deposits, further accelerating the rate of engine wear. Idling at high rpms (1100 rpm) increases cylinder pressure for more complete fuel combustion, but you'll use more fuel due to the higher rpm. Either way, you can't win.
Carefully monitored studies suggest that an engine idling for one hour is equivalent to two hours of driving. Imagine what this will do to your engine rebuild cycle!
Mac's can Google, can't they Al? 
Robin
06 Navion
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