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Oil Pressure

Posted By: Lister

Oil Pressure - March 01st 2019 5:32 am

When I start my van, it sits almost at the max which on my gauge is 60. I think its starts around 55ish
I've noticed many gauges on G20s go to 80 but mines definitely 60

After a while it settles down a bit and hangs around 45ish. is this normal? I mean 60 isnt that much really, it just freaks me out to see any gauge near its limit
Posted By: frscke1

Re: Oil Pressure - March 01st 2019 6:18 am

Yes your oil's cold N doesnt flow well at 1st.
Posted By: wrcsixeight

Re: Oil Pressure - March 01st 2019 6:34 am

Cold oil will pretty much always hit the bypass limit of the oil pump, at any RPM

On my Dodge when cold the max oil pressure I will see is 68, and this is cold or 3k rpm.
When it is hot, the ma pressure lowers to 62PSI, but it takes much more rpm to reah this maximum.

Thicker oils will raise oil pressure when hot, at lower rpms, compared to a thinner oil.

A quick difference in oil pressure readings for the same general temperature and rpm might be related to a failed oil filter or perhaps the oil itself got diluted with fuel making it thinner, or several other less likely possibilities.

They say as long as you have more than 10PSI per 1K rpm that is enough

it is NOT oil pressure keepinng metal fro metal in the bearings, it is the oil film strength. Oil pressure is more an indication of the rate at which oil is being pumped through the engine, and more is not always better. If it was we should all run 80w-90 gear oil and have the oil pump in bypass the whole time at 60+ PSI.

The seting of the oil bypass can be changed with either high FLow or high PSI pumps. High flow pumps pump more oil per revolution, high PSI pumps might do that and also have a higher bypass rating, the high flow pump could have the stock oil pressure PSI rating, it just gets there at lower rpm.
Posted By: Lister

Re: Oil Pressure - March 01st 2019 4:05 pm

Very interesting, good info thanks

tis strange my gauge only goes to 60 when I see others go to 80

I'll do an oil change at the weekend and see what happens
Posted By: frscke1

Re: Oil Pressure - March 01st 2019 4:41 pm

Mobil 1 N a new filter .... do the switch over.... ell worth it, IF your going to keep it.
Posted By: wrcsixeight

Re: Oil Pressure - March 01st 2019 5:02 pm

Dont discount oil pressure gauge inaccuracies.

I installed a mechanical gauge just because my stock gauge was reading low.

Mechanical gauge reveals good pressure.

I t'd the line so oem gauge still works. Very little correlation between the two.
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