no
It is not necessary.
there is more cargo than there is oil, or other liquids container ships use.
oil (A)
Uses of titanium: medical surgery, stomatology implants, aircrafts-spacecraft-ships construction, heat exchangers, sport accessories etc. Also compounds of titanium as titanium dioxide, titanium niobate, titanium tetrachloride have important and large applications.
Because they were ignorant.
Castrol Edge with Titanium which I believe is one of the best oils available.
"This object is 100% titanium."
Titanium sheets are mainly used for building aircraft wings.Because the sheets improve durability. But, they can also be used for building watercraft's, submarines and ships.
Steel, aluminum, titanium, and high strength metal alloys
Different ships use different fuels according to their needs. Most large cargo ships use bunker fuel which is a form of crude oil. Some ships use diesel fuel. Some modern commercial ships are employing nuclear fuels. Some military ships use diesel for their normal operating engines and for more speed they will use jet fuel for gas turbine engines.
it runs on oil
Pipelines, trains, trucks, pretty much everything that can carry oil. They use ships too.