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

Engine oil is vital for protecting a car’s engine. If your car requires 5W-20, can you use 5W-30 instead? Here’s why those ...

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.

That means these engines usually need lower-viscosity oil—oil that is “thinner” and flows more easily to form a cushion of lubrication between two parts. At lower viscosity, synthetic oil ...

However, before mixing two different engine oils, you must understand multiple parameters. Oil viscosity is listed on the front of the oil container. There will typically be two numbers and the ...

Motor oils use a rating system to classify oil by viscosity, which is a fluid’s resistance to flow. Thin fluids like water have a low viscosity, and thick fluids like Canada Post employees have ...

Most change the viscosity of the engine oil. Some also provide a coating of ... you make using the retail links in our product reviews. Learn more about how this works. Patrick Rall has been ...

Viscosity: Using CNG eliminates fuel dilution of oil and it thickens over time, which can have a negative effect on a lubricant's ability to protect the CNG engine. Oxidation: CNG engines go to ...