high viscosity requirements down a notch compared to API CK-4, resulting in added fuel savings potential. Because of this, before using an API FA-4 engine oil you’ll need to check with your ...

At lower viscosity, synthetic oil holds up better in high temperatures. If you’re the diligent type who checks your engine oil level at least once a month (as CR recommends), there’s a chance ...

Stick with the manufacturer's recommended motor-oil viscosity classification. For instance, if your car uses 5W-30 synthetic oil, upgrade to high-mileage oil with a similar 5W-30 rating.

Kinematic viscosity is expressed as centistokes ... of these recommendations is that the 5W-40 engine oil compares with the high temperature range of the 15W-40 oil but has a significant advantage ...

New EPA 2027 emissions rules also mean new diesel engine oil specs. A new generation of heavy-duty engine oils will feature ...

Multi-viscosity oils (5W-20 and 5W-30) are formulated to flow faster when cold while still providing high-temperature protection. However, the 5W-30 oil is more viscous than 5W-20 at the engine's ...

Changing oil in cold weather can take a toll on both machines and people. Working in subzero conditions quickly induces fatigue. As the ambient air temperature drops, oil thickens and equipment ...