The engine fan is controlled by a relay and a radiator temperature switch.
Unplug the switch at the radiator, and if the fan still runs, the relay is stuck on.
If you unplug the relay, it should stop. If not, you did not pull correct relay.
Engine oil gauge is for pressure, not level. And pressure should always drop at idle speeds. As long as it is over 40 psi when at higher speeds, then oil should be ok. Normally at idle, the pressure will drop as low as 7 psi.
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