If, after turning on the ignition of the truck, the oil warning light comes on and goes out as soon as the engine starts, what is the reason?

Question

DentroTest · Accepted Answer

When the ignition is switched on with the engine off, the oil pump is not turning, so there is no pressure in the circuit and the warning light stays on as a system check. The moment the engine starts, the pump immediately begins to push the lubricant; when the minimum pressure required to protect the internal components of the engine is reached, the pressure switch turns off the warning light. This indicator does not measure the oil temperature (which takes several minutes to reach with the engine running) nor does it reflect a fault in this case, since that coming on and then going out is the normal and correct sequence.

If, after turning on the ignition of the truck, the oil warning light comes on and goes out as soon as the engine starts, what is the reason?

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