Join Date: Jul 2007
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I'm a in school to become a diesel mechanic I know what I'm talking about.
The cylinder walls glaze due to the rings not having the higher combustion pressures from being under load pushing them outward. This allows the rings and cylinders and oil to all rub each other until they are happy and polished . This glaze is a bunch of combustion by product embedded in the walls from the lack of scraping by the rings.
A couple of hours probly wont hurt it. It happens a lot in big rigs. Guys leave their engines idling all night to keep the cab warm little do they know theyre ruining their engine. Hey think what you want, if your planning on letting it idle for more then 5 hours or so bump up the idle.