Today at work the factory Catapillar tech was working on one of our loaders. He pulled the rest of the block heater cord out(the excess was tyed up and put down in the engine compartment) and there was a sticker that said "unplug heater and wait 5 mins before starting." I asked why and he said it doesnt matter. I was wondering about my 6.0. Do I need to wait 5 minutes after I unplug it. I usually just unplug it, walk around and start it up. I also got to wondering what about starting it up while still plugged in? What would happen?