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Suddenly High Oil Pressure

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jawar666

15+ Year Contributor
103
1
Jun 5, 2007
Costa Rica, Central_America
The problem is the following:

I used to have the followings readings before September 9th:

Oil Pressure at start up in the mornings: 70-80 psi
Oil Pressure at idle once engine gets to operational temperature: 15-20 psi
Oil Pressure at WOT (15 boost psi with a 16g turbo): 110-120 psi

Now, in the morning of Monday September 9th I started my engine, I was ready to go to work, but somehting weird happened, my oil pressure gauge blinked twice and then I saw different readings from it since that moment, and the readings goes as follows:

Oil Pressure at start up in the mornings: 120-125 psi
Oil Pressure at idle once engine gets to operational temperature: 28-30 psi
Oil Pressure at WOT (15 boost psi with a 16g turbo): 140-150 psi

I thought my gauge or the sender unit was broken, so I borrowed a mechanical gauge from a friend to test, and the readings are pretty much similar, so my oil pressure gauge seems to be working correctly....


I haven't changed anything in the car, the oil I'm using is 20w50, the Balance Shafts were removed more than a year ago... I'm using a K&N oil filter... I do have an external oil cooler...


Any ideas on why the oil pressure changed suddenly?
 
Oil change? Temperature difference?

When you did the BSE did you port the oil hole?

Maybe the oil has cause a sludge build up and there's some back up? PCV malfunction?
 
Last oil change was 800 miles ago...

Weather temperature is pretty stable here around 67 to 74 Farenheit...

When we did the BSE we did the Head Oil Port modification, but we didn't do anything to the oil pump or so...

I haven't check the PCV, I'll do so tomorrow...
 
It's a spring/piston assembly found inside the oil filter housing. Failures are usually caused by oil caking, sludge buildup or gritty contamination. I'd recommend removing the OFH, disassemble it and diagnose the cause. If the bore where the piston rides is scored up you could hone it smooth, clean it out real well and reassemble. If the cause is sludge buildup, I would explore the extent of contamination throughout the engine and strongly consider a teardown, cleaning and rebuild.
 
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