Correct Oil Pressure Reading

Correct Oil Pressure Reading

Postby Safarimeister [OP] » August 19th 2020, 12:42am

I recently switched from 5W30 Conventional to 5W30 Full Synthetic. I have never paid a lot of attention to the pressure gauge, but while driving on a long road trip down to Phoenix, I did notice the oil pressure would drip below 40 and sometimes making its way back up to 40 at highway speeds. Keep in mind, outside temps have been between 92-115.

When I would slow down or stop, my gauge would read around 20.

On cold starts, it usually shows around 40.

Vehilce has 200K on it.

Should I go with a higher viscosity oil or is this normal?
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Re: Correct Oil Pressure Reading

Postby Big_kid » August 19th 2020, 12:57am

Old racer's rule says 10PSI for every 1000 RPM. According to that, you're fine. Seems like pretty good readings to me for having 200K on it. Keep in mind the dash gauges aren't the most accurate, they're there so you have an idea what's going on in your engine. "Real" numbers would require a mechanical gauge. Since you're not posting about a knocking sound and overheating, I'd say you're fine.
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Re: Correct Oil Pressure Reading

Postby Safarimeister [OP] » August 19th 2020, 1:11am

Thanks for the quick reply. I just drove 1800 miles to PHX. Two 13 hour days. The engine is real quite, except under load my idler bearing or water pump is growling like crazy.

I just dropped it off at Journeys Offroad for a lift, all new suspension, radiator idler bearing, water pump and a few more things.

I don't want to run into any issues on my way back up to Minnesota.
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