Motor oils. Part 2: Viscosity index

Viscosity is a characteristic of a material that characterizes the resistance of a liquid to spreading. The higher the viscosity, the slower the liquid spreads and the denser the liquid is considered to be.

More

Motor oils. Part 1: What are they?

The car moves thanks to the combustion of fuel. Simply put, the mixture of fuel and air enters each of the cylinders, where the piston compresses it, causing it to flash and catch fire.

More