1992 isuzu trooper oil pressure

Interesting question, answer below, but if you are referring to the spark plugs, I can think of no logical connection between what you refer to as "oil corrosion" and the oil pressure variation you say you are seeing. Chances are better that it is a bad connection or faulty oil pressure sending unit or faulty guage.
If you are referring to the fact that your oil pressure fluctuates at times while operating at a steady rpm, and you are sure the guage is OK, then that is a whole other problem. Hope this helps.

1992 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)
Vehicle Level Engine, Cooling and Exhaust Engine Engine Oil Pressure Testing and Inspection


Testing and Inspection


Check for dirt, gasoline or water in the engine oil.
Change the oil if dirt, gasoline, or water are present.
Check the viscosity of the oil.
Change the oil if the viscosity is outside the specified standard.
Refer to the Engine Lubrication.
Check the engine oil level.
The level should fall somewhere between the "ADD" and the "FULL" marks on the oil level dipstick.
If the oil level does not reach the "ADD" mark on the oil level dipstick, engine oil must be added.
Remove the oil pressure unit.
Install an oil pressure gage.
Start the engine and allow the engine to reach normal operating temperature about 80�C (176�F) .
Measure the oil pressure. Oil pressure should be: 392 - 550 kPa (56.9 - 80.4 psi) at 3000 rpm .
Stop the engine.
Remove the oil pressure gage.
Install the oil pressure unit.
Start the engine and check for leaks.

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