It is known that cars designed for one person will have different specifications than cars designed for sporting purposes.When buying a car you will be well informed about what type of motor oils are best for our car and will boost its performance.
It would be best if during the use of the car will be reached for only the original motor oils.
An oil is any neutral, nonpolar chemical substance that is a viscous liquid at ambient temperatures and is both hydrophobic (immiscible with water, literally "water fearing") and lipophilic (miscible with other oils, literally "fat loving").
Oils have a high carbon and hydrogen content and are usually flammable and slippery. The general definition of oil includes classes of chemical compounds that may be otherwise unrelated in structure, properties, and uses.
Oils may be animal, vegetable, or petrochemical in origin, and may be volatile or non-volatile.
They are used for food, fuel, lubrication, and the manufacture of paints, plastics, and other materials.Specially prepared oils are used in some religious ceremonies as purifying agents.Źródło: https://en.wikipedia.org/wiki/Oil
Just remember that buying a used car requires the driver to have a good knowledge of cars that will be needed for this, that has not been cheated.Therefore it is worth, before signing a contract to buy a car ride with him to the site, where you can seek a professional opinion about its condition.