Oil pressure drop?

[chilleblanco36]

I have a 2010 Tahoe LT WITH 149k miles. What’s considered quality parts besides OEM? I usually shop at O’Reillys.

 

[Foggy]

The BWD parts are good from Orielly.. as are the Standard Ignition Brands
I don't think they sell the "value line" which is a line that does suck

 

[chilleblanco36]

I called tonight and they have the standard brand that comes with the filter. Going to attempt to swap it without removing the intake. Just worried I won’t be able to get the filter out.

 

[wsteele]

I called tonight and they have the standard brand that comes with the filter. Going to attempt to swap it without removing the intake. Just worried I won’t be able to get the filter out.

I have posted this clip before, he seems to have a handle on a pretty quick job. Good luck.

 

[Fless]

The BWD parts are good from Orielly.. as are the Standard Ignition Brands
I don't think they sell the "value line" which is a line that does suck

BWD: Broken When Delivered

 

[chilleblanco36]

Got it out. Video helped a lot. Doesn’t appear to be clogged though. I’ll swap it all anyway

 

[wsteele]

Got it out. Video helped a lot. Doesn’t appear to be clogged though. I’ll swap it all anyway

FWIW, the pressures you report are consider “within acceptable tolerances” according to GM. They seem low to me as my well into six figures mileage wise 5.3L is pretty rock steady well above your numbers. I think if it were me in your shoes, I would be doing exactly what you are doing to try and find the root cause of the results.

 

[OR VietVet]

My 5.3, 136k, starts cold and idles at 48 psi and then after warms up will be rock steady at 40 psi.

 

[chilleblanco36]

Swapped it out with new sending u it and filter. It did not go over 40 psi on cold start but it did when I rev’d the engine higher. May change the oil again and use a different filter, or maybe just swap the filter

 

[wsteele]

My 5.3, 136k, starts cold and idles at 48 psi and then after warms up will be rock steady at 40 psi.

Mine is similar in every respect. The shop manual does give a much wider margin for "acceptable", shockingly low (single digits) for hot idle.

 

[OR VietVet]

The GM parameters are quite large at times.

 

[wsteele]

The GM parameters are quite large at times.

Yeah, I am thinking the conversation with my service writer at our local dealer (who I dearly love, the guy is super knowledgeable has done me so many good turns), wouldn't be very productive when he looked at my 6 psi hot idle pressure and said, "everything is fine according to the manual"...

 

[chilleblanco36]

So you think I should look into replacing the oil pump ASAP or what? Thoughts?

 

[wsteele]

So you think I should look into replacing the oil pump ASAP or what? Thoughts?

Sorry no, I don't think you need a new pump asap. I was referring to the shop manual spec of 6 psi at idle being within acceptable parameters. The numbers you quoted would be considered no trouble found according to GM. If it were me and it had dropped from where mine sits normally to your numbers, I would want to know why, but my first instinct wouldn't be to change the pump.

I would do exactly what you did and change the sender and screen (or perhaps first check with an analog gauge to verify it was reporting in error). If the sender and screen didn't get things back where they were before, I would probably next move on to testing to see if the o-ring between the pickup tube and pump had aged out and the pump was beginning to suck some air along with oil from the pan.

But in any case, your pressures are fine right now, according to GM.

 

[chilleblanco36]

I can’t say if I noticed it being any different before. My truck was in the paint shop for a month and getting it back had me monitoring everything closely and noticed it. It may have been this way for a while. Can’t remember. I’ve been more focused on my C6Z.

I’m getting ready for a trip from Al to SC and wanted to address if necessary.

 

[wsteele]

I can’t say if I noticed it being any different before. My truck was in the paint shop for a month and getting it back had me monitoring everything closely and noticed it. It may have been this way for a while. Can’t remember. I’ve been more focused on my C6Z.

I’m getting ready for a trip from Al to SC and wanted to address if necessary.

The shop manual says the minimum pressures for an engine at operating temps are:

6 psig at 1,000 engine RPM
18 psig at 2,000 engine RPM
24 psig at 4,000 engine RPM

Based on what you have observed, I wouldn't hesitate to take it on a trip, but I likely would watch it for trends.