What is the idle oil pressure range?

• A. 25-60 PSI
• B. 25-95 PSI
• C. 45-95 PSI
• D. 60-100 PSI

Answer: (A)

Oil pressure is driven by how fast the engine and its oil pump are turning and by oil temperature and viscosity. When the engine is idling, the pump runs slower, so pressure is lower, but it still must be high enough to keep bearings and components lubricated. For this engine, the acceptable idle oil pressure is about 25 to 60 psi. The lower end accounts for cold oil and the initial idle condition, while the upper end reflects the normal maximum you’d see even at light throttle once the oil has warmed and the system settles. Pressures in the 60 psi+ range at idle would be unusually high, and ranges that start above 40 or 45 psi miss the typical low-idle readings seen when the engine is not producing significant RPM.