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Discussion Starter #1
when i start my K1500 up i get oil pressure at closer to 60 pounds then when driving at speed on the highway it drops to 40 pounds stopping at a red light etc drops it to 20 pounds
this just started to happen never noticed it this summer when i got the truck

normal or a problem brewing??

Thanks

D
 

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A good standard to go by is 10psi for every 1000rpm minimum Also the gauge can be going south Those pressures dont sound bad at all. If you are that concerned I would install a mechanical gauge and watch it.
 

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My blazer the presure doesn't change that much but the truck I drive at work (93 3/4 ton 350 tbi) the presure seems to run about like what you discribed about 40 on freeway and 10-20 at a stop light. It's done that sents it was new.
 

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dude, i noticed my trash does about the same thing and i have an old school 350. i guess as the engine warms up the oil press drops. it still runs so i dont care <IMG SRC="smilies/usa.gif" border="0">
 

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Those are good oil pressure readings. No problem whatsoever.
 

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As long as you have positive oil pressure your good to go. Just remember when temps rise you oil viscosity breaks down, lowering operating pressures.
 

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Discussion Starter #8
I realize i will drop pressure as the oil warms up, thats why i am a little worried i never had this problem in the summer months with temps in the 90's
I just thought of a reason though
I did have one of the guys at work (i'm a car salesman) change the oil he could have put 5 weight oil in this would probably account for the pressure drop due to the thinner oil
 

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Yep, if the dude put in a thinner oil in your truck it would cause your pressure to drop. <IMG SRC="smilies/skull.gif" border="0"> No worries!
 

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So I've heard the 10 psi for every 1k rpms but when my system gets up to temp 180-190 my pressure drops to less then 10 (mech gauge) at idle and 650 rpm...it does climb quickly and I know that pressure and flow aren't the same and I have plugged the bypass to send the oil through the filter 100% and use 20w50....engine doesn't knock and have had the problem for awhile and haven't noticed any other problems....might try replacing the filter plate with the bypass unmolested....any ideas?????:confused:
 

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This is the spec for every engine I have worked on (except Harley:rolleyes: ):

15 psi minimum at idle
45-60 psi at operating speed (2000 RPM for my BII)
75 psi max

This goes for my little VW, as well as the Fair-Banks Morse deisels that are the size of my house.
 
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