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Discussion Starter · #1 ·
my buddy just bought an 04 duramax. he changed the oil in it and he put 10 quarts of oil in it and the oil pressure went to about 140..he added more oil and the oil pressure went down but still seems high..how much oil do the duramaxs need and what is normal oil pressure?
 

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They need 10 quarts....... The gauge doesn't even go up to 140........ IIRC mine usually read about 60 when moving.... lower at idle after warmed up....
 

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my buddy just bought an 04 duramax. he changed the oil in it and he put 10 quarts of oil in it and the oil pressure went to about 140..he added more oil and the oil pressure went down but still seems high..how much oil do the duramaxs need and what is normal oil pressure?
Oil level has nothing to do with oil pressure (other than no oil equals no pressure).
 

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Discussion Starter · #4 ·
after doing some research some of the 04s the gauge clusters went bad in them so that ended up being the problem..
 
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