High Detergent? High Definition? Howdy Doody? Just what, exactly, does it mean when the label on your vehicle's motor oil uses the initials HD?

Engine oil color reveals its age, contamination level, and operating condition. Fresh oil is amber or light brown. Oil darkened to black but still translucent after a few thousand miles is normal.

The oil in your engine can evaporate, but only under very specific — and extreme — operating conditions. These conditions occur when your engine is operating at very high temperatures, which can ...

Walk into any parts store and you'll see the rows of glossy bottles promising to stop engine wear, boost fuel economy, and make your old clunker run like it just rolled out of the factory. The auto ...

If you’re the kind of person who enjoys driving your vehicle, keeps up on maintenance, or actually knows what oil weight your ...

Engine oil is not only a lubricant but also a vital indicator of engine health. Comprehensive analysis and degradation monitoring techniques enable the detection of chemical and physical changes that ...

As GM Authority has covered at length, General Motors issued a safety recall several months back to address an issue affecting certain models equipped with the naturally aspirated 6.2L V8 L87 gasoline ...

Don't ignore what your car is trying to tell you. Here are four critical indicators that your card engine is on the verge of ...

As covered extensively in the past, General Motors is recalling nearly 600,000 vehicles in the U.S. in order to address a supplier-level defect affecting the naturally aspirated 6.2L V8 L87 gasoline ...

You might be relying heavily on your engine hours and overall mileage to determine when to perform maintenance, but you should pay attention to idle hours, too.