I have had a video of a Sentinel on youtube for several years now and yesterday I got an amusing comment, Who tuned that fire box!? That poor truck has an over rich burn condition! ,and needs more air to the flame! or less oil to the burner,failling that have it re jetted! I pointed out that it was coal fired and got this back, They are running her on Coal!? Why have they not converted it to run off waist oil, with a babington burner? That being coal smoke? Then They mite look in to a catalitic converter from a wood stove to fit it! You know, cut back the soot? This guy is a 27 year old American who obviously has never heard of heritage and keeping things in as near original condition as possible. At the moment I am waiting for a suitable reply which is being composed by my brother who drives it most of the time. Any other suitable comments to include are welcome..