Technician A says when oxygen is mixed with oil, it will extend the life of the oil. Technician B says excessively rich air-fuel mixtures can turn the oil black. Which technician is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question

Quizplus · Accepted Answer

Technician B is correct because excessively rich air-fuel mixtures can lead to incomplete combustion, which can cause soot and other combustion byproducts to contaminate the oil, turning it black. Mixing oxygen with oil, as Technician A suggests, would actually promote oxidation and degradation of the oil, shortening its life.

Technician a Says When Oxygen Is Mixed with Oil, It