Oil tankers are purpose-built ships used to move large amounts of (crude) oil over the World. Basically huge boat-shaped oil tanks with an Engine room and some crew space at the back.
they are all ships tankers are shooters i think and stemers are ships run on steam and liners are big long ships
cheveront
Mainly oil tankers.
An internal combustion engine.
Depends on type of engine, presumably diesel, and its draft (empty or full, or partial). A question that broad is impossible to answer or estimate. There a great range in the size of ocean-going tankers.
520
The Wankel rotary engine is a differing type of engine as opposed to the standard piston engine. The Mazda line of cars is the one that uses this type of engine.
Air Force Tankers such as the now obsolete KC-97 and the still in use KC-l35 are used to refuel tactical and strategic aircraft in flight. the tail boom operator is the Key Man here. there are more advanced models of aerial tankers, owing to the risks involved, this practice is confined to the Air Force, the Navy does not use aerial tankers, unlike the maritime type- sometimes called Fleetlines a shortened form of fleet lifelines. these are used for Underway refueling. (of ships)
Tankers transport liquids, These maybe motor vehicles or ships.
Pratt & Whitney F100 turbofan engine
Most large oil tankers simply carry the oil from one port to another or from an offshore installation to a depot.