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Old 06-17-2013, 05:31 PM   #1
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I just changed my timing chain, cover gasket, oil pump, and oil switch now its reading at the 3/4 mark instead of in the middle. What happened?
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Old 06-17-2013, 06:05 PM   #2
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Could it be cause I'm running 10-40?
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Old 06-17-2013, 06:24 PM   #3
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What was it running?
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Old 06-17-2013, 06:35 PM   #4
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It used to run around 60 psi on cold starts
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Old 06-18-2013, 01:00 AM   #5
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Could it be cause I'm running 10-40?
Probably. You Should be running 5-30
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Old 06-18-2013, 06:44 AM   #6
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The recommended weight is 10-30. How quick would I find out if the pressure really is too high?
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Old 06-18-2013, 08:35 AM   #7
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The recommended weight is 10-30. How quick would I find out if the pressure really is too high?
You sure about that I thought all GM vehicles are recommended to run 5W-30.
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Old 06-18-2013, 08:39 AM   #8
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Yea. The 3.4 takes 5-30 and the f body 3.8 takes 10-30. Later 3.8's do take 5-30 though plus my oil cap say 10-30
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Old 06-18-2013, 01:27 PM   #9
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Yea. The 3.4 takes 5-30 and the f body 3.8 takes 10-30. Later 3.8's do take 5-30 though plus my oil cap say 10-30
Regardless your ruining oil that is too thick. your Motor isn't being properly lubricated. Drain it and run what the service manual recommends
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Old 06-18-2013, 01:43 PM   #10
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Try putting your old OPS back on and see what the pressure is. I've had several replacement OPS bad out of the box in the past several years. When in doubt, use AC Delco replacement parts. ~FH
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Old 06-18-2013, 02:07 PM   #11
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The old one broke so had to replace it. I have to return this one now cause it fell apart. I hooked up a mechanical gauge and the pressure is between 60-69psi.
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Old 06-19-2013, 01:53 PM   #12
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I'd believe the mechanical gauge. Possible faulty oil pump pressure relief valve or some trash from the gasket change got into it? Maybe a quick drain, flush with diesel and filter change might yield some improvement. ~FH
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Old 06-19-2013, 01:59 PM   #13
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The pressure that the mechanical gauge shows is right where it should be
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Old 06-19-2013, 02:54 PM   #14
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Replace the oil pressure sending unit.
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Old 06-19-2013, 05:02 PM   #15
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Quote:
Originally Posted by jhobbins View Post

Regardless your ruining oil that is too thick. your Motor isn't being properly lubricated. Drain it and run what the service manual recommends
The service manual recommends 10w-30.
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Old 06-19-2013, 06:04 PM   #16
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The service manual recommends 10w-30.
Which is thinner than the 10w40 that you're running. Which could lead to your oil pressure being too high and your valve train not being properly lubricated
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Old 06-19-2013, 06:54 PM   #17
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Originally Posted by jhobbins View Post
Which is thinner than the 10w40 that you're running. Which could lead to your oil pressure being too high and your valve train not being properly lubricated
And cylinder walls on cold starts.
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Old 06-19-2013, 07:02 PM   #18
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I was running 10-40 to high mileage and a slight oil leak
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Old 06-19-2013, 08:33 PM   #19
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Quote:
Originally Posted by Chevy101 View Post
I was running 10-40 to high mileage and a slight oil leak
Higher weight oil will not help A high mileage motor. As said before your motor is not being properly lubricated and will fail pre maturely
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