Type M is generally recommended and used as a break-in oil for newly overhauled aircraft engines. Type M is generally used by engine overhaul and repair shops for the initial run-in of aircraft piston engines. Type M 20W-50 is designed for owners and pilots who want the performance of a multi-viscosity, mineral based piston engine aviation oil without dispersant additives. Type M contains the same high quality base oils and viscosity index improvers found in renowned X/C aviation oils.
Type M offers improved cold temperature starts and quick lubrication while also offering a full body oil for high temperature and high load operations over a single grade oil. Type M is recommended as a break-in oil for newly overhauled aircraft engines.