over powering your vessel

[NoTies]

A 6BT running so lightly loaded will eat turbo exhaust housings. Gamefishing operators only use these engines because they're cheap but the low loads they apply cost them in turbos.

[Diesel Bill]

Hi all, I missed this post when it came out. Past my bedtime I guess. As for running an engine at low RPM, low load, or excessive idling it will cause blowby past the rings and fuel washing of the bores and carbon build up behind the rings and crankcase oil contamination.
A few hours can be acceptable if you don't make a habit out of it. After doing the dirty deed you should run it up to put a load on it to burn out the carbon and get it hot enough to burn off any deposits on the valve stems and exhaust ports. I spent many hours cleaning piston ring grooves and valve stems before rebuilding engines.
As for trucks idling all night it's now illegal in many states and modern truck diesels are all electronically controlled and the computer will run up the throttle to keep the temps up where they belong. I'm not trying to preach as I've done long idling at times out of necessity. Just try to avoid it if you can.