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.

Synthetic oil is worth the extra cost for most drivers. It lasts 7,500 to 15,000 miles between changes compared to 3,000 ...

Toxic compounds that have commonly turned up in groundwater near military bases around the country have been found in two city wells just north of Davis-Monthan Air Force Base. Tucson Water officials ...