Just curious as dumb as this may sound I am very over protective over my Diesel’s LOL.

I live in Michigan where it is cold outside so I ALWAYS let my truck warm up to 110 ECT before driving.

I usually walk away and back into house and my damn truck idles up more on its own my guess because the VGT turbo which I’m gonna change but I use to have a 6.0 power stroke and it did this.

My question does the idling up on its own while the engine cold and being warmed up hurt the engine?

I keep walking out to hit the brake so it goes back to normal idle because in my mind I would imagine less work on the engine while cold is better?