Find out the differences between 5W-30 and 10W-40 lubricating oils

11 October 2023

Choosing the right lubricating oil for our engine may seem a complicated task and the consequences of the wrong choice may bring us some unwanted consequences. In order to avoid making costly mistakes, it is essential to understand the key aspects that differentiate the various types of lubricating oils. In this news article, we will explore the key differences between two types of widely used oils: 5W-30 and 10W-40, focusing on their behavior when hot and cold.

From the viewpoint of behavior when cold, oils with a lower SAE before the W will behave better starting at low temperatures. In other words, a lubricant with SAE 5W-30 will behave better when cold than a lubricant with SAE 10W-40.

In contrast, oils with a higher SAE after the W generate thicker films of lubricant and better protect the mechanical parts when the vehicle is already hot. However, excessive viscosity at high temperatures could cause more internal friction and poorer engine performance.   

In conclusion, selecting the right lubricating oil for our engine is a vitally important decision that mustn’t be taken lightly. The first thing to take into account is to follow the instructions given by the engine manufacturer, but it never hurts to understand the differences between the various SAE grades in their behavior when hot and cold, because it helps us to make an informed choice. An oil with appropriate viscosity will guarantee optimal engine protection and performance, preventing problems derived from excessive friction or unnecessary consumption. Keeping our engine correctly lubricated will not only prolong its useful life, but it will also contribute to a more efficient and safer operation at all times, contributing to lower energy consumption.