Correct answer
It can decrease.
Pressure can decrease because thinner oil offers less resistance to flow. A low reading alone does not establish that the oil is very hot: it can also relate to level, unsuitable viscosity, leaks, wear or other faults. Compare the reading with manufacturer conditions and specifications and follow instructions for pressure warnings. Absence of a visible fault does not rule out a problem.
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It can decrease.
It must always increase regardless of the engine.
Temperature and viscosity never affect pressure.
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