An oil can works by pressurising oil in the canister, allowing you to dispense a controlled amount of oil. This is particularly useful when maintaining machinery or vehicles, where too much oil attracts dirt and can be just as damaging as too little oil in the long run.
Buying an oil can
When buying an oil can, consider the capacity. An oil can that is too large is cumbersome, but a very small one will need refilling more often, which can also be annoying.
Most oil cans are made of metal or plastic. Metal oil cans are generally more durable and resistant to heavy use. Plastic oil cans are lighter and often cheaper, but they don't last as long as metal ones.
Finally, you have the choice of an oil can with a fixed or interchangeable nozzle. Many oil cans come with a flexible extension tube. This is useful for reaching difficult areas.