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Old 03-10-2012, 09:49 AM   #1
YJgirl1990's Avatar
Join Date: Feb 2012
Location: new hampshahhhh :)
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another question

My 92 has pretty high oil pressure the Gage is always between half and all the way up is that normal if not what could be the reasoning and what should Ido to fix it?

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Old 03-10-2012, 09:55 AM   #2
Join Date: Nov 2011
Posts: 717
is it numbered?

MY 94, 2.5L runs about 60 lb at idle or revved up some. That is about 3/4 of the way up on the gauge. Within reason, the higher the oil pressure the better the fit of the bearings, etc. Less slop so the pump can pump enough oil at lower rpm to keep the pressure up.

There is a relief valve in the oil pump that opens if the pressure gets too high. That is why it only goes up so far as you rev up the engine, increasing the pump rpm and increasing the volume/pressure of the oil.

Oil thins as it warms. Multi-viscosity oil (10-30) doesn't thin as much, but it also thins. It is just a viscosity of 10 weight at that temperature (50 deg) and the viscosity of 30 weight at that temperature (200 deg). Most people think that the oil is thicker at temp. Not so, just thins slower than a straight weight (say 10 weight). The manufacturers put waxes in the oil to get the multi-viscosity. In synthetic oil, it doesn't thin as much and they can achieve the equivalent of 10-30 or even 5-40 without adding chemicals/materials to get the multi-viscosity.

So, sounds like your oil pressure is normal and good.

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Old 03-10-2012, 10:11 AM   #3
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Join Date: Feb 2012
Location: new hampshahhhh :)
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What a relief I wasn't sure since im new and was worried I would blow up haha glad its good then. Also my jeep takes a second to start one I turn the key a few seconds will go by before it turns over and "comes alive " is that normal to or us my starter going?
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