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What to look for when you have low oil pressure on your DD15, the DD13 is very similar so this video can be used towards both. If you have a low oil pressure fault code or your oil pressure is below normal. You should stop and have it looked at immediately.
Normal oil pressure when the engine is cold should be greater than 60 psi, as the oil temp begins to rise, normal operating temperature, the pressure will drop and at idle should around 15-25 psi.
In this particular incident my customer would get to a stop and the oil pressure would drop for a split second to ZERO. Luckily we were able to repair the issue and get the truck back on the road.