Costco sells house-brand motor oil under the Kirkland Signature label it uses for many other products. Does this oil pass the ...

The lubricant must meet the requirements of the specific engine. Otherwise, it might not provide proper protection or could ...

There's a lot of hooha on most motor oil labels, but the basic facts remain the same. The most important is the weight or viscosity: 5W-30 in these examples. Amazon/CNET ...

Best diesel engine oil: Shell Rotella T6 Full Synthetic Diesel: Synthetic: 1 gallon/5 gallon: ... If an oil meets the American Petroleum Institute's engine oil standards, it'll have this label.

In addition to the oil type, you'll want to pay attention to the API service category and viscosity ratings shown on the labels of even the best motor oil brands before pouring them into your engine.

Engine oil additives make all sorts of promises about helping your vehicle's motor last longer and increasing your gas mileage. Here's what you need to know.

Q: What does the label on a motor oil container mean? A: The API label lets you know if the oil meets the current service rating as determined by laboratory and engine tests.

Yet, its motor oil products are limited to just two lines, namely its Pro Performance conventional oil and its SYN Full Synthetic oil, each available in grades of 5W-20, 5W-30, and 10W-30.