The majority of wear and tear to engines and gears happens during warm up. Therefor we ask you to warm your equipment up correctly.
After you do your pre-trip inspection and all is well. We ask you to not just let it sit and idle for 15-20 minutes but rather, ease it down the road to gradually get all the lubricants up to temp before working it. This lowers the time running cold when most damage occurs.
Notice the emphasis on the word EASE. Not only is this better for the engine but the rest of the drive train as well. The fluid in the gear box and rear-ends needs to warm up also.