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Believe it or not, it's not good to let a diesel idle for long periods of time when it's cold out. Someone else can chime in here, but I don't think it's good on these trucks even in warm weather because of the DPF.
When it's cold out, you'll get fuel washing by the cylinder. With the high idle, the truck warms up quicker allowing the truck to burn all the fuel.
I don't know why Ford doesn't make it an option from the factory. It's standard on a Dodge!
2010 F-350 Lariat / CCSB / 6.4L diesel / 4x4 / Automatic