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Old 01-25-2012, 02:58 PM
oh58pilot oh58pilot is offline
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Engine: 1999-2000 359ci (5.9L) Cummins ISB 24-Valve Diesel I6 235hp 460lb/ft (manual)
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Default Engine Warm up time

Hello all,
I'm having a debate about proper warm up time for the Cummins with a friend. It seems he thinks that his engine should be warmed up 15-30 minutes before driving. I think that is WAAAY too long.
I generally start my engine and wait till I have oil pressure, kick it up to about 12-1500rpm for about thirty seconds to a minute,(depending on outside temp), then start driving....slowly..keeping the rpm around15-18 for a few miles so that it gets to operating temp faster. He says I am damaging my engine by making it warm up too fast. I say he is damaging his engine by making it stay below operating temp too long. I also think he's wasting fuel and costing himself a lot of dough. I realize that colder weather would take a little more time, but... 20-30 minutes?
Any thoughts???
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