You might be aware that motor oils are labeled with designations like 5W-30 and 10W-40. If you've been wondering what this means, you're not alone. Many of the customers at Bob-Boyd Lincoln, Inc. are unaware of what these numbers are letters are for, so here's a quick guide.

These designations indicate the viscosity of motor oil. Viscosity describes how thick or thin a liquid is. Thin oils can move around easily and can do a good job of helping engines start quickly when it's cold. Thick oils are strong and durable, and they are ideal for use in high temperatures. Ideally, you'd want a motor oil that does well in your specific climate.

If a motor oil has a designation of 10W-40, this means its viscosity in the winter (W) is 10. Specifically, this is its viscosity when it's zero degrees Fahrenheit. Its viscosity when the temperature is 100 degrees is 40.


Categories: Service