What does Technician A assert about the time it takes for diesel engine oil to blacken?

The assertion that diesel engine oil blacks out quicker than conventional oil is based on the characteristics of diesel engines and the oil used within them. Diesel engines operate at higher temperatures and pressures compared to gasoline engines, leading to a more rapid accumulation of particulates, soot, and contaminants in the oil.

As these contaminants build up, they contribute to the oil darkening more quickly. The combustion process in diesel engines produces soot as a byproduct, which is then suspended in the oil. This is a normal occurrence, and while it may indicate that the oil is doing its job of capturing contaminants, it also means that the oil will appear darker in a shorter period of use compared to oils used in gasoline engines, which may not experience the same level of sooting.

In contrast, the other options suggest a slower blackening of oil or imply that the oil would either never blacken or turn clear, which does not reflect the typical behavior of diesel engine oils under operational conditions. As a result, Technician A's assertion aligns with the understanding of how diesel engine oil functions in relation to soot and contaminants.