Phillips 66 Type M Aviation Oil 20W-50 is an ash-less, non-dispersant, multi-grade engine oil recommended for use in aircraft piston engines where the operator prefers a mineral oil-based engine oil that does not contain dispersant additives. It provides easier starting and quicker oil circulation at low temperatures compared with single-grade mineral oils, while maintaining high film strength at high temperatures and under high loads for protection against wear and piston scuffing. 

This oil is typically used as break-in oil for newly overhauled engines where all-mineral type oils are recommended. The multi-grade formulation helps reduce cylinder glazing tendency during break-in. Break-in normally is accomplished in less than 25 hours of engine operation. 

Benefits 

• Easier starting and quicker oil circulation at low temperatures compared with single-grade oils 
• High film strength for protection against wear and piston scuffing, even under high-load conditions, such as takeoff, and at elevated operating temperatures 
• Reduces cylinder glazing tendency during break-in, compared with single-grade oils 

Applications 

• Aircraft piston engines where the operator prefers a non-dispersant engine oil 
• Break-in oil for newly overhauled aircraft engines