That i do not know, but when the bunker barge ( floating gas station ) try to screw you over, it is generally for many tonnes of the stuff.
On my first ship the engineer apprentice was supposed to fill a little motor oil on the engine, he put over 1000 liters in it, and it dident mind.
I am not engineer, but they soon figure out i have been around, and so i got to do much of their work.
Of course some times i screw up, like on the Daihatsu AUX engine where i did not secure the fule in / outlet to the injector properly, that cost a load of engine oil as it have been contaminated by fule oil.
Same engine for some reason blew its fule oil pressure gauge now and then, guess who got to clean up the mess that made, damn things do not run on the nice clean diesel we know from out cars, a lot blacker stuff, though it was also not the heavy crude oil you need to keep at a high temperature just to be able to pump the damn stuff around, and if the heating coils in your fule tank blow,,,,, well you are dead in the water soon as you can almost walk on the damn stuff when it is cold.