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That's light grey smoke, clearly visible in this video without the backlighting to confuse. Unburnt fuel is black.
Hmm no, Sorry Chris. In the broadest stroke of the definition, and we're talking half a click wide, that's a mostly true statement. Strictly talking Diesels, The actual definition for black smoke is an incomplete burn. Not enough air for the fuel being injected. It's burning, but its an incomplete burn. Once the rpm starts coming up and the turbo starts making boost the black smoke will start to clear up. It was always a catch 22 in the older engines before electronic controls and Variable Geometry turbo's, you have to cob the fuel to it to build the fire to make the turbo work but you don't want to belch out clouds of black smoke, AKA Soot. Now, with VG Turbo's you can make boost at idle and throttle up with reckless abandon and maybe just get a slight haze of smoke.
For those of us who live and work and make our living in the diesel engine world, anything from a light blue, to grey to pure white, is just called white smoke. Unless proven otherwise that, is
unburnt fuel. If you stick your face in the stack and it smells a little sweet you're burning coolant, if it smells like grandma's 75 Chevy Impala or in your case maybe grandma's 75 Holden Sandman, its burning oil.