88M Tractor Trailer and HEMTT Practice Test 2026 – Complete Exam Prep

When the oil pressure gauge does not indicate any pressure within 10-15 seconds during cold weather starting, the appropriate action is to shut off the engine. This is critical because a lack of oil pressure can indicate that the oil may not be circulating properly within the engine. Continuing to run the engine under such conditions can lead to significant damage, as sufficient oil pressure is essential for lubricating engine components and preventing wear or engine seizure.

In cold weather, oil can become thicker, and if the pump is unable to circulate the oil, it poses a risk to engine integrity. Shutting off the engine promptly allows for further investigation, such as checking the oil level and ensuring the proper grade of oil is being used for the temperature conditions. This proactive measure helps to avoid potentially costly repairs and maintain the vehicle's operational reliability.

Taking no action or attempting to continue running the engine could lead to severe damage. Thus, it is essential to address the lack of oil pressure immediately by shutting off the engine.