What does the oil pressure gauge indicate?

• A. Temperature of oil
• B. Supply of oil being delivered
• C. Volume of oil in sump
• D. Pressure of air

Answer: (B)

Oil pressure gauge shows the pressure in the engine’s lubrication circuit. It indicates how hard the oil pump is delivering oil to the bearings and moving parts, which is what keeps everything properly lubricated and cooled. A normal reading means the system is delivering adequate lubrication; a low reading can signal problems like low oil level, worn pump, or blocked passages, while an abnormally high reading may point to a relief valve issue or excessive pressure. It doesn’t measure oil temperature, which would be shown by an oil temperature gauge; it doesn’t indicate how much oil is in the sump, which would be read from the oil level dipstick or indicator; and it isn’t measuring air pressure.