Hydraulic fluid

Hydraulic fluids are a large group of liquids made of many kinds of chemicals. They are used in automobile automatic transmissions[?], brakes, and power steering[?]; fork lift[?] trucks; tractors; bulldozers[?]; industrial machinery; and airplanes. The three most common types of hydraulic fluids are mineral oil, organophosphate ester[?], and polyalphaolefin[?]. Some of the trade names for hydraulic fluids include Durad®, Fyrquel®, Skydrol®, Houghton-Safe®, Pydraul®, Reofos®, Reolube®, and Quintolubric®.

Some hydraulic fluids have a bland, oily smell and others have no smell; some will burn and some will not burn. Certain hydraulic fluids are produced from crude oil and others are manufactured.