Question about 1991 Nissan 240SX

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Low oil pressure after engine has heated up.

My car is a 1991 nissan skyline R32 GTR, stock engine RB26DETT.
I chose the 240sx because there was no category for skylines.

I just recently traded cars, and I'm now doing all the regular maintenance. I just did an oil change w/filter, using mobil1 5w-30 full synthetic. Since then, the oil pressure hovers around the 2-3 kg/cm^2 range on a cold start. When the engine heats up, its drops to 1, or even lower :s. I have the car parked right now, and im really hoping its not my oil pump. Hopefully somethings wrong with my stock gauge...
oh and the car is completely stock, other than exhaust and a turbo timer.
plz help.

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  • Scott Bauer
    Scott Bauer Feb 10, 2009

    hey thanks alot elmo35 & transit360.
    I was recommended 5w-30, but Ive done a bit of reading, and apparently 10w-40 is commonly used in these cars as well. And i put in a FRAM oil filter, and apparently napa makes one thats way more preferred. Looks like ill be doing another oil change, if the problem is still present ill hook up an aftermarket gauge.


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With the car warmed up, oil pressure should be 1.5 kg/cm^2 @ 800 rpm. If your not getting that much, you may want to get an oil pressure gauge (mechanics type) to check it. Low oil pressure after engine has heated up. - 8d774a8.gif Using this type of gauge will give you an accurate reading. The stock gauge may not be very accurate, especially if the sending unit is old.

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Posted on Feb 10, 2009

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Always confirm your readings from your gauges with another tool. In this case, you need to attach an oil pressure gauge to the sending unit, or even tap into an oil pressure line with a T fitting.

This will tell you if it is INDEED low pressure. Don't get worried until then.

If low oil pressue is confirmed, then it could be you oil pump, but it could also be worn main bearings or other worn parts, resulting in loose tolerances and therefore low oil pressure.

So doublecheck the pressure first. Then go from there.

Also, if the synthetic is a thinner viscosity than factory, then or course the oil pressure will be lower. You can try using a higher viscosity in the meantime to increase your pressure.

The handheld gauges are not expensive, and you can use them for fuel gauges also. Or you can borrow it.

Good luck. I like those Skylines.

Posted on Feb 10, 2009

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Well asuming you used the right oil filter and grade of oil then you need to verify with a mechanical gauge (not the one on the car) if your oil pressure is low then youll need to replace rod and main bearings and oil pump but first make sure your oil filter is right then put another on to make sure its not a pressure relief valve in the filter good luck

Posted on Feb 10, 2009

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