What is a healthy oil pressure?

[jbuck07]

Guys, I just changed my oil and had to use the old oil filter because freakin Summit racing sent me the wrong replacement filter! I have to make do with the old one since I live overseas and just can't go to the auto parts store for another. So I have to wait another 2 weeks to get another one in the mail.
Anyways, I noticed a significant change in oil pressure after I changed the oil. I don't know of its because I have the old filter on still with fresh oil or what. Before, I ran easy 60-65 psi on cold start up and when it got warm, it dropped to about 40 at idle an hit 47-50 psi when I got on the gas. Now, it's a little over 40 psi at start up and drops down to about 20-25 at idle then I'll be lucky to hit 40 when I'm on the gas. She's got a little over 77k on the original motor. I also use 10w-30 Mobil 1 full synthetic.

Any thoughts??


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[99Vortec]

I think the Vortec likes 5w-30 oil.

I could be wrong though.

 

[retorq]

10 PSI for every 1000 RPMS is fine.

 

[SunlitComet]

I think the Vortec likes 5w-30 oil.

I could be wrong though.

you are correct in your thinking.

 

[jbuck07]

Damn. Didn't know that. I'll change it when I get the correct filter in. That would explain the lower pressure with a heavier weight...


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[Gatorlac]

heavier weight equals lower pressure??

 

[SunlitComet]

not really. but unless someone put a generic oil cap on your engine the oil weight should be right on the cap.

 

[jbuck07]

Just ordered another filter from Summitracing. They better not screw this order up or I'm not gonna order from them again. I went with a K&N gold filter. It's the one I had on there before...


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[jbuck07]

Turns out, I got another oil filter from summit and it was the wrong one. I called them and complained and they told me it was one for a 2wd tahoe. I didn't know there were different ones for the 4wd. Although, summit said it was good for the 4wd.
I ended up getting one from autozone and they sent the right one. Thank goodness.


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---------- Post added at 05:02 AM ---------- Previous post was at 04:59 AM ----------

And, I put Mobil 1 5w-30 and the oil pressure hasn't changed. That's weird because before the oil pressure was pretty high now it's sitting at mediocre levels.... Any explanation for this??


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[God]

Perhaps you slightly overfilled your oil before causing above average oil pressure? Try adding another half quart