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Old 07-30-2014, 12:36 AM   #1
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Question Oil pressure?

What could cause an low oil pressure after oil change? I had a friend of mine change the oil in peggy and since then shes been throwing the low oil pressure, as i continue to drive after 10 mins or so it builds up. the only thing that was different is i used the high mileage 10-40 oil.
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Old 07-30-2014, 01:16 AM   #2
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The oil pressure sensor is notorious for going bad on the 3.8 engine. I would replace it and see if that fixes the problem.
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Old 07-30-2014, 06:47 AM   #3
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assuming you verified the level is good. high mileage oil is no good. i tried to run it in a couple of my cars and it acted like i had 2 month old gas in it the whole time.

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Old 07-30-2014, 10:56 AM   #4
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I have high mileage oil in my LeSabre (163k miles), and it runs fine...
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Old 07-30-2014, 11:05 AM   #5
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maybe it depends what kind, i use regular valvoline changed every 5k, i had probably 180 when i tried valvoline high mileage on my bonnie and it ran pretty rough, but i dont think it lost mileage. had maybe 160 when i tried it on my old 03 monte and that lost some mileage and ran rough as heck till i changed it back
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Old 07-30-2014, 11:14 AM   #6
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I'm running Mobil1 Super 10w30 high mileage formula, seems like a quality brand at a good price when I changed my oil a couple months ago. Although I don't really think there are too many considerable differences between oil brands these days (when comparing equal weights).

To the OP, I though most 3800-II'* suggested 10w30... does yours specify 10w40?
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Old 07-30-2014, 11:39 AM   #7
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it recommends 10-30 for my engine
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Old 07-30-2014, 11:59 AM   #8
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Why did you use 10w40? Technically that is a bit heavier/thicker than 10w30. Slower moving oil, which it would be on start-up before the oil gets hot, may be tripping a low pressure sensor.

Generally I'd say stick with manufacturer recommendations on fluids, unless there is a real compelling reason to switch to something else.
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Old 07-30-2014, 12:34 PM   #9
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you are right but the second number is operating temp rating so it would be the same at start up and too thick at operating temp
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Old 07-31-2014, 01:02 PM   #10
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could it cause damage to the engine?
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