2008 Denali XL 6.2L Low Oil Pressure - Fixed

[PG01]

Thanks for this thread.
Really sounds like what my 2013 Tahoe needs.
Except my Tahoe has a 5.3 engine , I guess the fix is about the same?

Yes and no.....5.3 does have same issue but there are variables and to absolutely say thats your problem isn’t 100% correct so before tearing your lower half apart.... You gauge can be off, sender bad, screen behind sender can be clogged. Some other things to ask.....Whats your oil pressure currently? At cold start idle and running down the road? What oil you running? Filter? How long are your oci’s?

 

[PG01]

@Baddawg start here

https://www.tahoeyukonforum.com/thr...ronicles-of-low-oil-pressure-by-07burb.62826/


https://www.tahoeyukonforum.com/threads/is-this-oil-pressure-normal.110105/

 

[Baddawg]

@Baddawg start here

https://www.tahoeyukonforum.com/thr...ronicles-of-low-oil-pressure-by-07burb.62826/


https://www.tahoeyukonforum.com/threads/is-this-oil-pressure-normal.110105/

Thanks, Pete.
My issue looks like the original post here, not quite as bad, my warm oil pressure at idle stays above 20#.
I hadn't heard about the pressure sensor and screen issue and I will look into that.
I like the add two quarts and see what happens to the oil pressure to test for pick up O ring.

 

[kbuskill]

Thanks, Pete.
My issue looks like the original post here, not quite as bad, my warm oil pressure at idle stays above 20#.
I hadn't heard about the pressure sensor and screen issue and I will look into that.
I like the add two quarts and see what happens to the oil pressure to test for pick up O ring.

That's a pretty good test... just don't drive it like that. The crankshaft will whip the oil into a frothy mess and you will be pumping oil and air.

Oil is a good lubricant, air.... not so much.

 

[Baddawg]

That's a pretty good test... just don't drive it like that. The crankshaft will whip the oil into a frothy mess and you will be pumping oil and air.

Oil is a good lubricant, air.... not so much.

Right, run it at idle, OK.
Maybe move it around some at low speed, low RPM, low load , sorta OK, not to bad .
Take it out on the hiway and drop the hammer, pretty bad idea.

 

[mikeyss]

Good write up on the repair. One thing I found when replacing oil pan gasket is you do not have to totally remove the front diff. If you remove the lower shock bolt that is under the axle shaft, then the diff bolts, it allows the axle shafts to drop down further thus allowing the diff to drop a few inches lower.

 

[mikeyss]

This is a example of what I mean. See how the lower shock bolt is in the way if there was a axle shaft above it?

 

[General Stalin]

Awesome write up. Very likely this is my issue as well as my oil pressure in my denali is looking identical to yours in the first pics (below 20# at warm idle, a little above 40# at cold idle).

I have replaced my oil pan gasket before as I was leaking oil out of the factory gasket, wish I had replaced this too while I already had it off...

From my experience you do not need to remove the differential to get the pan out, like mykeyss said. You can just unbolt it and let it drop down a few inches and the pan can slid in and out fine. That's what I did. Saves you a lot of time and effort for sure.

 

[CobraKing]

Thanks for this thread.
Really sounds like what my 2013 Tahoe needs.
Except my Tahoe has a 5.3 engine , I guess the fix is about the same?

Same fix with the 5.3 - I did it on my '14 PPV with that motor. Truck's RWD so it went a lot quicker due to not having a front differential.

 

[Ponchonutty]

What’s this part do and where does it install?

Did you install that deflector too?View attachment 217945
https://www.amazon.com/General-Moto...XW7JJF4VAGZ&psc=1&refRID=M2CW0KYYFXW7JJF4VAGZ

 

[PG01]

What’s this part do and where does it install?

..........‘This little oil deflector mounts to the oil pressure relief valve in the oil pan of GMC 5.3 motors. When the filter screen for the valve lifter manifold plugs up, the pressure relief valve sprays the bottom of the pistons until the oil rings stick and the engine starts burning oil. The first warning is a low oil pressure light/ message. If you don't catch it in time, the engine can seize. The first two years of this 5.3 engine, a poor assembly procedure often resulted in a cut o-ring on the oil pump pickup tube, aerating the oil resulting in accelerated wear, clogging the aforementioned filter screen. A lot going on here. GM came up with this deflector on later versions of the engine..’........

 

[Ponchonutty]

Gotcha. Well my Denali with the 6.2 I believe is in need of the o ring replacement so that’s why I was asking. I hadn’t noticed it using any oil in the 208k miles I’ve ran it

 

[donjetman]

What’s this part do and where does it install?

I installed it on the 6.2 in my 07 Denali per the instructions in TSB 10-06-01-008M

https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

 

[jberrymd]

just had our 2009 Yukon XL denali at mechanic with low oil pressure/lifter tick. Pressure is 20 when on highway and down to around 10 at idle. We did an oil additive cleaning and then changed the oil from 5W30 to 0W20. Now pressure id 40ish at startup and drops as it warms up and driving. I see a few bubbles on dipstick, but not froth. Could it still be the o ring? How much should I expect a non-dealership mechanic to charge for the o-ring replacement?

 

[jberrymd]

I will try the front end down test first to see if that helps with the pressure.

 

[General Stalin]

O-ring is sort of a big job. I don't know the typical labor quotes for this job but I bet they charge 4-8 hours + fluids and replacement gaskets.

 

[InTNallen]

I have 145 k on my 2007 Yukon Denali 6.2. My pressure when hot was dropping to around 25 psi, I changed to 5wx40 FS and have noticed about a 10 psi increase when hot to just under 40. I’m going to add ATP AT-205 that I saw on you tube by Kilmer to see if it can soften than oring up and maybe save me some work. If it works I will go back to 5wx30, if not I may keep using the 5wx40? If it keeps pressure, up maybe that’s fine?

 

[Geotrash]

O-ring is sort of a big job. I don't know the typical labor quotes for this job but I bet they charge 4-8 hours + fluids and replacement gaskets.

Honestly, I didn't find it that bad. You don't have to drop the whole diff. It's enough to loosen the passenger side mount and the bolts for the CV axle flange, and let it hang. I then dropped the steering rack and let it hang from the tie rods and also removed the cross member. I could do the job again in 2 hours and am just about to because I'm putting a new oil pump in now. An air impact wrench was worth its weight in gold for the job.

 

[PatDTN]

If you're pulling the pickup tube off the oil pump does that cause the pump to drain or is there a check valve? There is a hex plug on the driver side that allows you to fill the pump with oil. With the right setup you can pressurize the whole oiling system through that.

 

[donjetman]

I didn't have to prime mine or anything when I replaced my pickup o-ring.