[LonePalm]

Bunker fuel or bunker crude is technically any type of fuel oil used aboard water vessels. Its name is derived from coal bunkers, where the fuel was originally stored. In 2019, large ships consumed 213 million metric tons of bunker fuel.

Table of fuel oils
No. 1 fuel oil, aka, #1 distillate, #1 diesel fuel, Kerosene, Jet fuel
No. 2 fuel oil, aka, #2 distillate, #2 diesel fuel, Road diesel, Rail diesel, Marine gas oil
No. 3 fuel oil, aka, #3 distillate, #3 diesel fuel, Marine diesel oil
No. 4 fuel oil, aka, #4 distillate, #4 residual fuel oil, Bunker A, Intermediate fuel oil
No. 5 fuel oil, aka, #5 residual fuel oil, Heavy fuel oil, Bunker B, Navy special fuel oil, Furnace fuel oil
No. 6 fuel oil, aka, #6 residual fuel oil, Heavy fuel oil, Bunker C, Marine fuel oil, Furnace fuel oil

Note: None of this is remotely as heavy as what was burned in merchants in WW2 and nothing like heavy crude we import from Venezuela. Most people would be hard pressed to tell most of these fuels apart if they saw them in glass beakers.

SpyNavy

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)

[Porkchop]

Re: Fuel oil

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IIRC the Russians use “Mazut.” which is a grade somewhat below Bunker C. Their aircraft carrier “Admiral Kuznetsov” usually has a huge exhaust plume due to this.

🐷