Also,
> very low-sulfur fuel oil for the maritime industry
I thought the maritime industry didn't care one bit about the environment and would use nasty fuel once in international waters?
They don't, but if the low-sulfur fuel is cheaper, I'm sure they would use it --- that is, unless it starts causing engine problems; ULSD has lower lubricity than regular diesel:
https://en.wikipedia.org/wiki/Ultra-low-sulfur_diesel#Lubric...
As of 2020 the sulphur limit has been lowered from the previous 3.5% to 0.5% (which is still a lot higher than modern road diesel). Alternatively, ships can use scrubbers to remove sulphur oxides from the exhaust gas.
http://www.imo.org/en/mediacentre/hottopics/pages/sulphur-20...