How cares fluid dynamics for different fluids?

It is that branch of science which deals with the motion of the fluids.

Newtonian fluids flow faster as you increase the pressure on it. A non-Newtonian fluid flows slower or becomes more viscous. A good example is a paste of cornstarch in water. The harder you push...

For example-------- oil is added to the engine of a car to decrese friction

That depends wether you are in the metric system or the system used by the US. In the US the mesurtements are Ounces, Pints, Quarts, and Gallons

The most common method of classifying fluids are through a measure of viscosity; how close to being soilid. Peanut butter would have a very high viscosity, where gasoline or water are very low....