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Originally Posted by Gittyup
I always, always, always, let the engine idle at minimal rpms for a minute or two before I turn it off. I was told a long time ago by a old time tractor mechanic to do this because it reduces valve wear. I do it on all my equipment, even my cars and trucks. I've never had an oil burner, and I think this really helps prevent it.
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On a non-turboed engine, I don't think it makes any difference if you let it idle a bit before shut down, because cutting off fuel is cutting off fuel.
On a turbo charged motor, you want to idle it a bit to let the turbo cool, especially when the turbo's been worked hard.
Then again, maybe a bit of idle is good to allow the motor to cool a bit... I do know that with diesels, you don't want to let them idle to long because you can cause wet stacking, which is bad for the motor.