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Oil pressure measurement
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Todd
Posted 2021-09-02 5:34 AM (#614675)
Subject: Oil pressure measurement



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Hi folks.
I would like to measure the oil pressure on my car using a manual oil pressure meter. For this it is of course necessary to remove the oil pressure switch. Is there a risk that it will leak after screwing it in? What else do you have to consider when measuring? Thanks in advance for your answer.

I've always ridden a 20W50 mineral oil. But the engine is specified for a 20W40 oil, which I have been using recently. I would now like to test whether the oil pressure is still OK.
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Viper Guy
Posted 2021-09-02 9:22 AM (#614677 - in reply to #614675)
Subject: Re: Oil pressure measurement



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I believe you don't have to be concerned whether 20W-40 will allow for any change in oil pressure readings vs. 20W-50. After all, when new these cars ran mostly 30W in the summer and 20W in the winter (in most states). Very seldom was multi viscosity used then, 20W-40 should be totally adequate.

I used 10W-40 in my '59 DeSoto 361 CID and never experienced any abnormality.

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Mopar1
Posted 2021-09-02 9:29 AM (#614678 - in reply to #614677)
Subject: Re: Oil pressure measurement



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20W-40?
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Todd
Posted 2021-09-04 4:09 AM (#614744 - in reply to #614675)
Subject: Re: Oil pressure measurement



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Thanks Viper Guy. Yes, the 1960 OEM specs says SAE 30 or 20W-40.
In this country, the scene is often of the opinion that old engines with more than 200k should be given a thicker oil (20W-50), because bearing clearances have increased due to the long service life and thicker oil fills these gaps better. That is why it is better to fill in a thicker oil.
I now drive the 20W-40 and don't notice any difference. Nothing rattles in the engine and it purrs the same way.

To come back to the oil pressure switch ... can it be screwed in and out without any problems?

Edited by Todd 2021-09-04 4:13 AM
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1960fury
Posted 2021-09-04 9:03 AM (#614748 - in reply to #614675)
Subject: Re: Oil pressure measurement



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Nothing wrong with an oil that stays "thicker" at high temperatures, as these engines get pretty hot, but why the **** only 20 at the lower end? The thinner the oil at cold starts, the sooner the bearings are lubricated and 99% of engine wear occurs at cold starts. You can get 5w50, which I use in summers, 0w40 in winters. 5w50 or 0w40 wasn't available yet in 1960, but if it was, they would have recommended it.
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Viper Guy
Posted 2021-09-04 10:29 AM (#614754 - in reply to #614675)
Subject: Re: Oil pressure measurement



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Location: Branson, MO
To come back to the oil pressure switch ... can it be screwed in and out without any problems?

Yes, it can be. Just be careful not to cross thread when reinstalling it. Might not hurt to put a little plumbers tape on the threading of the switch.
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Todd
Posted 2021-09-04 1:25 PM (#614759 - in reply to #614675)
Subject: Re: Oil pressure measurement



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Thanks a lot guys!
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1960fury
Posted 2021-09-04 7:53 PM (#614768 - in reply to #614754)
Subject: Re: Oil pressure measurement



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Viper Guy - 2021-09-04 10:29 AM

To come back to the oil pressure switch ... can it be screwed in and out without any problems?

Yes, it can be. Just be careful not to cross thread when reinstalling it. Might not hurt to put a little plumbers tape on the threading of the switch.


It is a NPT and must provide ground.
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