If the oil pressure gauge does not indicate any reasonable amount of oil pressure within blank of starting the apparatus, the engine must be stopped immediately.

• A. 1 to 2 seconds
• B. 5 to 10 seconds
• C. 15 to 20 seconds
• D. 30 seconds

Answer: (B)

Oil pressure should come up quickly once the engine starts. If you don’t see a normal oil pressure reading within five to ten seconds after starting, you’re not circulating oil properly, and continuing to run risks severe engine damage from lubrication failure. The window of five to ten seconds gives enough time for the oil pump to prime and the pressure to rise to the normal operating range; waiting longer than that increases the chance of bearing and pump damage.

Waiting only one to two seconds is typically too short to expect pressure to register, while waiting fifteen to twenty seconds or thirty seconds is unsafe because the engine could be running without adequate lubrication for too long. If no reasonable pressure appears within five to ten seconds, halt the engine and investigate the oil system before attempting to restart.