Phillips 66 Type M Aviation Oil is an ashless, nondispersant, multigrade 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.
Type M Aviation Oil is used as break-in oil for newly overhauled engines where all-mineral type oils are recommended. The multigrade formulation helps reduce cylinder glazing tendency during break-in. Break-in normally is accomplished in less than 25 hours of engine operation.
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
SAE Standard J1966
U.S. Military Specification MIL-L-6082 (obsolete)
Aircraft piston engines where the operator prefers a nondispersant engine oil
“Break-in” oil for newly overhauled aircraft engines
Im Not sure how to review oil. This works great as Break in Oil if it is what you need.
February 20, 2019
Q: Is there a shelf life for 20W-50 Mineral oil?
Per Phillips Tech support:
No set shelf date as long as kept in controlled environment. They do suggest that the product be tested before use if 5 years or older.
Like other oil suppliers, Aeroshell as an example, there is not a specific "shelf life" listed, but just a recommended re-test time from date of manufacturer.