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What additive is used in oil to hold particles in suspension?
What is a dispersant?
What does the letter “W” mean after the viscosity number?
What is tested under colder temperatures.
The primary purpose of a lubricant is to?
What is to reduce friction between moving parts.
A number that indicates the effect of temperature change on the viscosity of the oil?
What is the viscosity index.
A colorless, almost tasteless, oil obtained from petroleum?
What is mineral oil.
Specific Gravity is a comparison of the weight of a substance to the weight of an equal volume of?
What is Distilled water.
What percent of normal engine wear is due to lack of lubrication during the start-up cycle?
What is 80%
The first additives incorporated in straight mineral piston engine oils were based on the metallic salts of?
What are Barium and Calcium.
What is the most critical lubricating point in a gas turbine engine?
What is the exhaust turbine bearing.
What is the specific gravity of oil?
What is 0.9
What aircraft reciprocating engine pressure lubrication system stores the oil in an external tank?
What is a Dry sump.