Most are transitioning to SAE 10w-30, but depending on equipment builder ... In the past, there have been similar shifts in preferred engine oil viscosity grades. An example is the transition ...

Let’s explain all of those confusing numbers, letters and terms to help you choose the right oil for your car.

Motor oil comes in a variety of forms, designated by pairs of numbers, but the most common two are 10W-30 and 10W-40. What's the difference between them?

Kinematic viscosity is expressed as centistokes (cSt) and is a measure of resistance to gravitational flow. It is a primary component of how SAE oil grades are defined (15W-40, 10W-30, 5W-40 ...