This message is not to the considerate diesel owners who idle for a few minutes. Thank you. This message is to those diesel owners who did not read the owners manual or were recalling the diesels of decades ago. There is a risk to your modern diesel engine by excessive idling.
Quoted from RV The Magazine -- Winter 2011, Page 8
Diesel IdlingMore support on the same issue comes from RVBasics on the subject of diesel idling.
Shady Spring, West Virginia
As a retired diesel electrician, I support Jim Harper’s opinion on excessive no-load diesel idling (August 2010 RV View). Diesel engines are so efficient that they generate little heat when not doing any work, so idling when cold can actually harm any diesel, especially a modern, computer-controlled engine with a soot filter. The low temperature idling causes incomplete combustion and soot (an abrasive) to get into the lube oil and can clog the pollution exhaust filter that must be burned off with extra fuel by the engine. Read and follow the engine manufacturer’s instructions. Idle only to bring up the air for the brakes and suspension. By then the oil will have circulated and it will be safe to drive at moderate speed and load until the engine reaches operating temperature. If you are still concerned and must operate your diesel at high speed and heavy load immediately, do what standby diesel generators and emergency diesel fire trucks do: run your electric block heater, with care, so the engine is somewhat warm when it is first started.