Works in road diesel engines as long as they are not too high tech, so should work in most marine diesels.
It will of course completely shag your engine after not too long, but you'll probably save several hundred quid before your several thousand quid engine is scrap! /forums/images/graemlins/grin.gif
During fuel strike of 2001? I used tescos sunflower oil in my landrover with tdi engine , had to thin it a bit with 28sec heating oil mainly to ensure good flow through the filters, lost a little power , stunk like a chip pan fire but never missed a days work and covered 150 miles per day throughout strike and never queued at fuel pumps once ! not sure whether common rail engines would cope as well as conventional diesels. Cant see any reason why not though, a diesel will near enough burn anything injectable. Many years ago "Tomorrows world" did a feature on South Africa and showed how tractors were running on straight sunflower oil there with only a loss of around 5% power. Also sunflower oil is a far better pump lubricant than low sulphur diesel, a small proportion added to every tank of fuel would certainly help pump and injector longevity.
We still run ALL of our tractors (Massey Furgeson and John Dere) on oil. they trawl 130,000 hectares of sugar cane ever year as well as general farm transport.
We have used it many many times in Landcruisers, but do find they loose rather more power than we'd like..