GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

oil pressure

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Old 12-08-2009 | 12:08 AM
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okay so this past weekend i changed my oil in my truck. Since the change, i have noticed that my oil pressure seems to be higher than it was before.
In my first oil change i used all of 6 quarts and I didnt notice any change in the pressure. This is time i used about 5 and 1/2 and my gauge seems to be reading a little higher number than befor while crusing. now again i didnt really pay attention to my gauge before but i know for a fact that it wasnt as high as it is now. what i am using is Royal purple 10w-30. another thing to add where i am at right now i havent seen tempurature above 50 for a good two weeks some have gone down to the 20's..does this have anything to do with it? and final question how much pressure can these new trucks take before its bad.
Old 12-08-2009 | 12:27 AM
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i run purple 10w-30 only because i'm over 100k. you should probably be running 5-30 since your truck is new. yes, the low temperatures will thicken the oil. the pressure is safe until the truck freaks out (codes). on a serious note, the oil pressure gauge is the best judge of what is safe for your truck. just keep an eye on it, royal purple seems to thin out a little bit over the first few hundred miles. as long as the pressure stays below 65-70 psi (that's about 3/4 up on my gauge) then you should be good. FWIW my oil pressure is about 42 at idle at 70 degrees ambient temperature.
Old 12-08-2009 | 12:31 AM
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i use royal purple 10-30 and my engine has been fine.. wuts the oil pressure reading since ur oil change?
Old 12-08-2009 | 02:33 AM
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i know its not the oil itslef doing it, i was just wondering if there was a a real problem i was looking at here. there seems a to be a light at the end of the tunnel now! it reading about 45 to 50 at crusing an about 40-42 at idle. it just seems everytime i look at it, it has never read that high. im guessing it is due to the cold temperatures and not something serious.
Old 12-09-2009 | 07:52 AM
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After the motor is fully warmed up, the outside temperature should not affect the oil pressure any differently than before.
Old 12-09-2009 | 08:01 AM
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i would use 5w-30
Old 12-09-2009 | 11:19 PM
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+1 he is right
Originally Posted by suddenurge
After the motor is fully warmed up, the outside temperature should not affect the oil pressure any differently than before.
i wouldn't worry about it too much. this may just be a new car thing.
Old 12-10-2009 | 12:53 PM
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well i guess im going to have wait a little bit to change my oil because this oil change only has a good 500 miles on it. but thanks for the info!!
Old 12-10-2009 | 01:23 PM
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royal purple aint no good. use mobil 1
Old 12-10-2009 | 03:05 PM
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im using 10w30 since thats what the dealership put in the last time they changed it.


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