I would have thought it would be one of the typical injector cleaner type fuel treatments, of which Forte is highly regarded and i've been told an MOT failing older Diesel will often be a pass after half a bottle of Forte has been added directly to the fuel filter (if you have the type which can be pre filled before offering up) and the rest into the fuel tank.

That's all i can imagine it is, quite why it's referred to as some special additive for low blow engines i do not know.

Lots of people use such additives, some Diesel owners use a dash of Millers fuel additive every fill up, which does the same thing but on a continual process and increases the cetane rating of the fuel a useful couple of points to boot, i'm a Millers user of many years.

Snake oil? i don't think the more well regarded products are but others do.

My understanding of LSPI/Superknock (more my best guess actually, since it was very unclear in early discussions) was/is that its pre-ignition which can involve detonation, worst-of-both-worlds stylee.

Classically these are separate phenomena, though frequently confused..

In that case a cleaner that removes potential sources of ignition could be of benefit.

Distilled water /steam is an effective cleaner of carbon deposits which often cause pre-ignition.

IIRC calcium-based detergents in oils are supposed to specifically contribute to LSPI inititiation. I don't know how effective water is at removing calcium deposits from cylinders, but it shouldn't hurt.

That's basically what the video tells us edlithgow, except the water idea.

I'll stick a bottle of H2O in the tank next time I fill up - still or sparkling? :)

Of course it goes in with the air rather than with the fuel, though a turbo in the way would complicate things. Wouldn't want water droplets, maybe not even tiny ones, hitting your turbine blades, so you'd either have to use steam (might it condense out?) or inject downstream of the turbo.

I suppose theoretically a bit of ethanol as a bridging solvent would allow a little water to be mixed with the fuel, but I havn't heard of it being done for decoking..