All of the following can cause a low oil pressure condition EXCEPT:
A) fuel in lube
B) excessive main bearing clearance
C) oil pump relief valve stuck closed
D) excessive rocker shaft bushing clearance

Question

Quizplus · Accepted Answer

An oil pump relief valve stuck closed would actually cause high oil pressure, not low. The relief valve's purpose is to open when the oil pressure reaches a certain high threshold to prevent excessive pressure in the system. Choices A, B, and D would lead to a decrease in oil pressure due to dilution of the oil, increased space for the oil to fill, and leakage past worn components, respectively.

All of the Following Can Cause a Low Oil Pressure