DAY 2002A Limits Practice Test

Engine oil pressure minimum

80 psi 0 psi 40 psi 110 psi

Correct Answer:

40 psi

Explanation:

Oil pressure must stay above a minimum level to ensure oil keeps flowing to all moving parts for proper lubrication. When the engine is hot and running at normal speeds, you expect the pressure to be above this floor; it can be higher when the engine is cold or at higher RPM. The specified minimum around 40 psi serves as that floor to prevent excessive wear. If the pressure drops to zero or very low (like 0 psi), that signals a serious problem with the oil pump, pickup, leaks, or viscosity, and the engine could be damaged. Pressures like 80 psi or 110 psi are typical during higher RPM or cold conditions, not the minimum acceptable value. Therefore, 40 psi is the correct minimum.

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