After engine starts, how long should you wait for oil pressure to register before shutting down and contacting fire garage?

• A. 5-10 sec
• B. 10-15 sec
• C. 15-20 sec
• D. 20-30 sec

Answer: (B)

Oil pressure doesn’t appear instantly after you crank the engine—the pump needs a moment to prime and circulate oil to all the moving parts. You should wait about ten to fifteen seconds after ignition for the oil pressure to register on the gauge. This window gives the system enough time to come up to pressure and confirms lubrication is ready before you proceed. If no pressure shows within that span, shut down and contact the fire garage, since a lack of oil pressure can indicate a pump failure, low oil level, or another lubrication issue that could cause serious engine damage if you keep operating. Waiting less than ten seconds risks dismissing a slow build as normal, while waiting much longer than fifteen seconds unnecessarily delays addressing a potential problem and leaves the engine unlubricated longer than needed.