Question 202Motor Plants - Assistant Engineer

The correct answer is C) a change in the oils viscosity. A 'Blotter test' is a simple field test performed on the lube oil of a diesel engine to detect any changes in the oil's viscosity. This can indicate potential issues with the engine, such as excessive wear, contamination, or degradation of the oil. By monitoring changes in viscosity over time, the engineer can identify when the oil needs to be changed or the engine serviced. The other answer choices are incorrect because they do not accurately describe what a Blotter test can determine. Specifically, a Blotter test does not measure the specific gravity (A), flash point (B), or TBN number (D) of the oil.