The crossword solution for the term CRUDE, E.G. is OIL. Crude OIL is a naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials. It is a fossil fuel that is used to produce gasoline, diesel, and other products. Crude OIL is typically found in underground reservoirs and is extracted through drilling. It is then refined into various products, such as gasoline, diesel, and jet fuel.