Oil viscosity chart

The SAE (Society of Automotive Engineers) has developed a means of classifying lubricants in order to specify their viscosity levels when hot and when cold.
The viscosity designation is made up of two numbers separated by the letter “W” (for “Winter” for the cold grade).

The numbers that come before the W refer to the product’s cold grade, i.e., its viscosity at low temperatures.
he lower the viscosity when cold, the more fluid the oil is at low temperatures and the more easily it can be pumped.

Greater levels of fluidity at low temperatures make cold starts easier. The numbers to the right of the letter “W” are its hot grade.
The higher the grade, the more viscous the oil will be at high temperatures.
To find out which oil and which viscosity you should use for your vehicle, refer to the manufacturer's service manual.