Air compressor made of a light metal

An air compressor to supply a compressed air system of a motor vehicle with compressed air, said air compressor having a crankcase, a cylinder housing connected to the crankcase a cylinder head, a crankshaft arranged in a rotatably mounted manner in the crankcase, a cylindrical piston connected via a connecting rod to the crankshaft, which piston is arranged axially movably along a cylindrical running surface of the cylinder housing, at least one piston ring or oil scraper ring which is arranged in an annular groove on outer lateral surface of the piston, a compression chamber which is formed above the piston and is closed off by the cylinder head, further having an intake duct and an outlet duct which are formed in a cylinder head upper part of the cylinder head, wherein the intake duct is assigned at least one suction valve and the outlet duct is assigned at least one pressure valve, wherein the crankcase, the cylinder housing, the cylinder head and the piston are produced from aluminum or an aluminum alloy, and that the at least one piston ring or the at least one oil scraper ring is produced from grey cast iron or from polytetrafluoroethylene (PTFE).