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 numbers are so important.

The Japanese automaker's switch to 0W-20 motor oil may have boosted efficiency and cold-weather performance, some drivers ...

You've always been good, we hope, about making sure the right grade of oil is put in your car, whether you do it yourself, or you have it changed by professionals. So, if your car requires 5W-30 oil, ...

There was a time when motor oil was motor oil. The engine in your car or truck was built with low stresses in mind, with wider tolerances and the expectation that it would have to be overhauled and ...