One of the biggest reasons not to idle a diesel is called "diesel wash". Modern diesels run very cold. Without sufficient heat in the combustion chamber the fuel does not get thoroughly burned. That results in the unburned fuel "washing" the sides of the piston sleeves of the lubrication that is necessary to keep the piston rings sliding easily. That friction causes early failure of piston rings and premature and excessive scaring of the cylinder walls.
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Ernest Jenkins
2005 Newell Thunder
Shakin the open road!
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