At idle, a lower oil pressure is normal.

• A. Idle speed
• B. High idle
• C. Crankcase pressure
• D. Cold start

Answer: (A)

Oil pressure in an engine follows engine speed and oil viscosity. When the engine is idling, the oil pump turns slowly, delivering less flow and thus producing lower pressure. That reduced pressure is expected and falls within normal operating range for idle speed. If you increase engine speed to a high idle, the pump spins faster and oil pressure rises toward normal operating values, not at idle. Cold start can show different readings because oil is thicker when cold, which can affect pressure, but the typical baseline at idle remains to be lower due to the pump’s slower rotation. Crankcase pressure is a different measure related to blow-by and venting, not the lubrication oil pressure the gauge indicates. So the statement aligns with engine lubrication behavior: lower oil pressure at idle is normal.