The present textbook contains information about the purpose, field of application, physico-chemical and operational properties of fuel oil, commercial-grade fluid materials as well as glue used for vehicles. The methods of producing fuel oil from oil products and their purification in order to better physico-chemical and operational properties of doping are considered in the textbook as well. The textbook provides information about saving in fuel oil, its regulation and record, and reusing oil. The textbook is intended for students of vocational education ((5310600-Vehicle Engineering (by industries and sectors)) and it is also recommended for students of vocational education (5140900 "Mechanization of agriculture").