This manual on fuels, lubricants, and coolants is one of a series of power mechanics tests and visual aids on automotive and off-the-road agricultural and construction equipment. Materials present basic information with illustrations for use by vocational students and teachers as well as shop servicemen and laymen. Focusing on fuels, the first of three parts discusses areas such as compression and fuels, octane ratings, selecting fuels for liquid propane gas engines, diesel fuel characteristics, and storing fuels. Part 2, Lubricants, describes engine oils, engine oil ratings, contamination of oil, mistaken ideas about engine oils, storing and handling engine oils, and hydraulic and transmission fluids. Part 3 focuses on coolants and discusses topics such as parts of the liquid cooling system, water as a coolant, warm weather conditioning of the system, preventing corrosion and deposits, and water pump and fan lubrication. Each part concludes with test questions. Answers to the test questions are appended. (A supplementary 35mm color slide set is also available--see availability note.) (LRA)