What do the numbers on oil mean?

The higher the number, the thicker the oil at a specified temperature. Is thicker oil better? In some circumstances, thicker oil can be used to compensate for increased bearing clearances (gaps between bearing and rotating shaft) that have developed over the years.

What is the difference between 5w 30 and 10w 40?

A 10w-40 motor oil is a thicker oil at startup than a 5w-30 motor oil. Therefore, 10w-40 oil clings to the engine’s moving parts more than the lower viscosity 5w-30 oil.

What is difference between 5w 30 and 5w 40?

5w30 is engine oil that has lower viscosity 5 and higher viscosity 30. 5w40 is engine oil that indicates the weight and viscosity of the engine. 5w30 has lower viscosity hence it is suitable to use in hot or lower temperatures. 5w40 has higher viscosity hence it is not suitable at all temperatures.

How do you read engine oil grades?

In simple words, the number preceding W represents the parameter. Tells us how the oil will flow in cold conditions. The smaller the number, the better will be the flow. For instance, a 5W-30 oil will have a better cold flow than 10W-30 engine oil.

What does CF mean in engine oil?

The second part,CF, is a diesel engine oil rating, ‘C’ being diesel and ‘F’ being the performance level.

What does CF mean in motor oil?

There are two categories: gasoline and diesel. Category S is for “Spark Ignition”, for Gasoline and category C is for “Compression Ignition’, for Diesel. For both, the letter S or C is followed by another letter. For example, SM or CF. The higher the letter, the more recent the technology of the oil.

What happens if I use 5W 30 instead of 5W 40?

In practice, this means that each oil is just as viscous at lower temperatures and will remain viscous at -30°C, however 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to ambient temperatures of 50°C, as opposed to 30°C.