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Originally Posted by mrlmd1
if it sits running for 10-15 min., won't that have it warm up to normal operating temperature?
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Yes, mostly. It probably won't hurt anything, really.
I did exactly that for a LOT of years but then saw an opinion or two that said you don't really get the condensation out of the pipes by just idling (and you likely leave a small puddle of rusty water on the floor). Also that everything doesn't circulate completely with long periods at idle.
Then there is the cooling question with an air cooled engine and/or a coolant circulation question with a liquid cooled one.
It is also generally recommended that you don't idle any engine for long periods of time (except those that are designed for it). Big diesels seem to be an exception; maybe they are designed for it.
Then I got to thinking about all the engines we had around the farm that we didn't bother to start up every few weeks during the winter........that lasted what seemed like forever......and I changed my mind.
It is just an opinion.