Color will vary between oils, and it is not an indicator of oil quality or suitability. An oil’s color should not be judged by light reflected from a sample; instead, the sample should be tilted to allow the color of light transmitted through a film of the oil to be assessed.
Some oil discoloration is normal in engine use of gas turbine oils.
- The extent of discoloration will vary with the oil in use and the severity of the engine.
- Excessive discoloration can indicate engine problems or contamination.
- Black oil is not an oil problem; it arises due to specific engine conditions.
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