Chassis Grease

"Black gold" is an informal term for petroleum or crude oil, a naturally occurring, dark-colored, and valuable fossil fuel used for energy and as a raw material in many industries. Here's a more detailed breakdown: What it is: Petroleum, also known as crude oil, is a naturally occurring liquid found beneath the Earth's surface, composed primarily of hydrocarbons. Why "black gold": The term "black gold" highlights the high economic value and importance of petroleum, both as a source of energy and a raw material for various products.