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 cost of oil surged past $100 a barrel after Iran named Mojtaba Khamenei as supreme leader. Follow Newsweek's latest ...

Climate change is intensifying risks to water, sanitation, and hygiene (WASH) services in rural Cambodia, raising questions about how climate-resilient services can be delivered equitably and who ...