Question #9ae29

1 Answer
Mar 19, 2015

The smaller the number before the W, the easier it is to start your car in low temperatures.

The W stands for "Winter" and the number in front of the W is a measure of the oil's viscosity or resistance to flow.

When you see oil grades like 5W, 10W, 15W, etc, the lower numbers indicate lower viscosities.

If there is less resistance to fluid flow at low temperatures, the engine starts more easily.