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Thread: Dropping Oil Pressure - Yes I know.....

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    Expert AJTich's Avatar
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    Lightbulb Dropping Oil Pressure - Yes I know.....

    Hi,
    I fitted an engine oil pressure gauge to my 2003 GU 3.0 litre Patrol.
    I use Penrite 5W50 oil, changed every 5000km.
    Recently on longer (warmer) trips the oil pressure drops as follows:
    a. 2500RPM: 80 PSI drops over time (an hour) down to 60PSI
    b. 2000RPM: 65PSI drops over time down to 40PSI
    c. after an hour highway driving on taking foot off accelerator, drops to idle and pressure drops down to 10PSI maybe less, sets off my low pressure alarm.

    My mechanic reckons it is an oil viscosity issue, so we increased it to 10W50, made no difference last trip out.
    He gave it a Wynn's engine flush and changed oil to 15W50 per Nissan Manual.
    He bolted in a pressure gauge and said at 20 on mine is 27, so likely all ok....
    BUT....why does it drop about 15PSI while driving over time...??
    Is it just oil viscosity, or..has someone else seen similar??
    Any help, ideas ........ Thanks.
    Last edited by AJTich; 20th October 2015 at 12:47 PM.
    AJTich
    2004 GUIII, white ST, 3.0L manual wagon, NADS,EGT/Boost,Water Temp/Oil Press gauges, drawers, UHF, stubby cooler on the 4WD selector...
    "I don't get bogged, I have unplanned 4WD training activities..."

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    The master farter
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    Let me guess you have the Redarc oil pressure gauge? I fitted one and mine also did the exact same thing until the gauge finally died and wont read oil pressure at all. If the OEM oil light isn't coming on then I would say is the gauge, as I believe the OEM senders are switched at 10psi for the light to come on the dash.

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    AJTich (21st October 2015)

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    Expert AJTich's Avatar
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    Thanks Mudski.
    I was coming around to that idea too, but...was worried about it being a real problem with my truck.
    As of now, will reset my alarm to lower, and watch the pressure go up and down, and hope, expect it is getting thru the engine correctly.
    And will use the NISSAN Pressure switch to tell me if anything is actually wrong..
    My gauge only a year old. Might call them to see what can be done...
    AJTich
    2004 GUIII, white ST, 3.0L manual wagon, NADS,EGT/Boost,Water Temp/Oil Press gauges, drawers, UHF, stubby cooler on the 4WD selector...
    "I don't get bogged, I have unplanned 4WD training activities..."

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    Mudski?? Your pressure dropped as you were driving too? ..and then just died??
    I thought it was all things like Main bearing wear, or those terrible engine death things.
    It still goes up and down as i accelerate...just at lower pressures...
    If it is the same, then was it gauge, or sender? No replies from REDARC for past week.
    Might go say hello at the 4WD show and ask them...that might get thier attention...
    AJTich
    2004 GUIII, white ST, 3.0L manual wagon, NADS,EGT/Boost,Water Temp/Oil Press gauges, drawers, UHF, stubby cooler on the 4WD selector...
    "I don't get bogged, I have unplanned 4WD training activities..."

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    Patrol God
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    As I mentioned a few days ago in another thread my workmates redarc gauges died in a similar fashion. His egt gauge went sky high and he shit bricks but it was a faulty gauge or the sender unit.

    Sent from my SM-T705Y using Tapatalk
    2005 TD42TI

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    AJTich (21st October 2015)

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    Patrol God threedogs's Avatar
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    GU's have iffy sender units my oil light used to come on, I'd pull over check the dip stick all good,
    restart the motor and the light would go out.
    You'll need to match the sender ohms to the gauge wouldnt you
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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    AJTich (21st October 2015)

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    Threedogs,
    The gauge sender is in a T-piece with the Nissan switch. The sender and gauge came together, so hope, assume they are matched..

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    The master farter
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    Quote Originally Posted by AJTich View Post
    Mudski?? Your pressure dropped as you were driving too? ..and then just died??
    I thought it was all things like Main bearing wear, or those terrible engine death things.
    It still goes up and down as i accelerate...just at lower pressures...
    If it is the same, then was it gauge, or sender? No replies from REDARC for past week.
    Might go say hello at the 4WD show and ask them...that might get thier attention...
    Yes it dropped whilst driving then just died to the point where its doesn't work at all. So your is a Redarc too?

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    AJTich (21st October 2015)

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    yep.. bugger.

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    The master farter
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    Ok I just spoke with Redarc. I have two options.
    1. To test the sender unit with a multimeter to see if I get any voltage change in the sender unit. If theres no voltage the sender is no good. And they will replace it.
    or 2. Remove the gauge and sender and send it back for them to test.
    Now I just need my car back so I can test it. Lol.

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