Quote:
Originally Posted by pawoSD
A 617 will warm up to pretty much operating temp within 10-15 mins of idling....depends on the idle speed. My dad's winter SD idles around 900 (on purpose) and it warms up pretty quick.
Longest I've left mine running/idling in the cold was maybe an hour....when it was quite cold (5-10F) and the engine temp/oil temp did not fall below 80C.
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I've only done that a handful of times, when it was well below 0F. The engine will eventually warm up but the rest of the drive train is still cold anyway. If I'm that concerned, I just plug it in. If the thermostat is correct it will stay above 80C, even in very cold weather.