A majority of car owners takes their vehicles to a garage for oil change, or if we try to do it ourselves, we often browse through the menu and use whichever oil the manufacturer recommends. Although there is nothing wrong with either scenario, knowing a little about what goes on with your vehicle and having some information regarding the best motor oils for your car is always a good idea as this information can come in handy. Here, we will be comparing the specifications and properties of engine oils 5w30 and 5w40 so you can have a better idea about which oil to use for your car.
The Society of Automotive Engineers (SAE) has established a statistical code for determining motor oils in accordance with their viscosity characteristics, ranging from low to high: 0, 5, 10, 15, 20, 25, 30, 40, 50, and 60. Viscosity is a liquid’s resistance to flow. Liquids which are thin and runny (like water) are assigned a lower viscosity whereas liquids which are thick and consistent (like honey) are assigned a higher viscosity value. The numerical 0, 5, 10, 15 and 25 are post fixed with the alphabet W, which stands for “winter”, or low temperatures, and not “weight”.