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Is Your Gmt-900 Truck Or Suv Using Oil

RyanbabZ71
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Is your GMT-900 using oil  

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mc7719 Enthusiast

mc7719

Posted
Posted (edited)

My Truck is burning 2L of oil every 5000kms up here in Canada and I've been told by 2 dealerships that anything less than 1L/1000kms will not be addressed by GM and will be considered "normal".

 

Do they realize that if that little nugget of info were to get out into the mainstream their sales would go down by 50%?

 

"Buy our vehicles, topping up your oil twice between 5000km interval oil changes is "normal"." Geez, such a disappointment.

 

Anyone else getting the same runaround?

 

 

I have been driving under an oil consumption test since GM did my last oil change. Today the "Add Oil" msg came up after 4000kms. Took it in, and on the spot, the service guy was like "yup, no good, Can you leave it here for 4 hrs?" and explained the bulletin about the valve covers and the AFM deflector, etc. etc. Anyway, it also involves cleaning the cylinders and rings? No charge. So I guess we'll see what happens.

 

Does someone have a copy of this Bulletin? So I can read in detail what they are doing before I go pick it up in a few hours?? Thanks...

 

Oh and I should mention... its the 5.3L w/AFM, and 95,000kms on the clock. AND as an added plus, I'll plug the dealership (Murray GM in Abbotsford, BC) since they have been very helpful in dealing with all of this with no grief. Gave me a coffee and a muffin while I waited, and then drove me home and will pick me up.

Edited by mc7719
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GuyGene
GuyGene

I've been watching this oil usage issue a long time now. Sick of it. My '96 5.7 used NO oil! And I could get 20 mpg highway. Extended cab, loooong bed too. Dagnabbit, GM is running customers away.

Jsdirt
Jsdirt

Yep - they've forced alot of manufacturers to cut corners just to survive.   The EPA has done more harm to this nation the past 20 years than good. Another gigantic, bloated, goverment bureaucracy t

Cowpie
Cowpie

It is a sad testament to GM quality. My factory remanned 12.7L Detroit, 704,000 miles into its second life, only uses about 1 qt per 10,000 miles. Just did oil change on it at 21,580 miles on the oi

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mc7719 Enthusiast

mc7719

Posted
Posted

What they are going to do won't help but let them do it anyway.

 

 

Its not costing me anything. Might as well try.

oulmanpe New Member

oulmanpe

Posted
Posted

'08 Silverado 5.3L Alum w/AFM @ 65K miles. Have seen as much as 4 qts oil drop between oil change. Change every 3500-4500 miles w/ whatever the stock 30W oil is at the oil change shop. Never any signs of leaks. Never any low oil warning only a sudden drop in oil pressure and erratic oil pressure gauge. Have it scheduled for a dealer oil consumption test tomorrow. I've owned several new vehicles including 2 F150s and a Ram 1500 over the past 20 years and never had this serious of an issue. This was my first Chevy vehicle (ever) and this is really making me question my decision. Hopefully the issue is resolved correctly and under warranty or it will definitely be the last GM product I buy.

hillbilly4u Enthusiast

hillbilly4u

Posted
Posted

Thought I would post, since its been 9 mths. ago, that I asked Mod to help create this poll. Have been checking back and watching the pages build up. Glad to see, some have seen, head way into this problem, although I haven't. Currently using 2 1/2 qts. oil every 5000k. Have 71k on the clock now. 14k and I've spent aproximately 75 bucks extra in oil besides the changes. Thats 7 1/2 qts. going where? Have noticed a little decrease in power lately, just wondering if the cats are starting to plug or O2's fouling. All that oil has to be going somewhere, and I haven't noticed any smoke or leaks still. If any GM corporates are still lurking. Check my records. I sold the HHR and my Trailblazer. The Silvy would be gone, but I really like pulling into different dealerships, since I travel alot, and watch the faces of potential customers, as I put oil in my 4 yr old truck LOL.

yukon_denali_05 Enthusiast

yukon_denali_05

Posted
Posted

I drive my truck very little. About 20 miles a week on avg and maybe do a 300-400 mile road trip once every 6 was. I have 6.0 and very solid engine. I typically change my oil every 5k miles or 6 mths. I use 5 qts of royal purple 5w-30 and 1 qt of Lucas synthetic engine oil stabilizer. Truck maybe burns less than half a qt. Shes got 70k miles on her now.

Z45 Senior Enthusiast

Z45

Posted
Posted
1 qt of Lucas synthetic engine oil stabilizer.

 

Additives should not be used as fluid life will be compromised. Adding anything foreign to your oil can change its viscosity. Some types of after-market oil additives cause a quite high viscosity at operating temperature. While an additive might improve bearing wear, it can often cause poorer upper-end wear.

 

People selling oil additives may be sincere, but they don't have to live with the results. They simply smile a lot on the way to the bank.

 

I was just reading an article about Lucas and something caught my attention. The article said this. "Lucas Oil's not-so-secret ingredients are self-reliance and shrewd marketing", nothing said about superior products..

mtiffinal Enthusiast

mtiffinal

Posted
Posted

I'm still doing an oil consumption test at the dealership. 70,000 miles now and they just added a quart, it's been 1,800 miles since last oil change. I was told they will contact GM and call me back. I'm sure it will go back into the shop for work, just not sure what they'll be doing. This will be the third time in the shop for some sort of repair due to this oil consumption issue. I'll post more when I get some details.

hillbilly4u Enthusiast

hillbilly4u

Posted
Posted

I'm still doing an oil consumption test at the dealership. 70,000 miles now and they just added a quart, it's been 1,800 miles since last oil change. I was told they will contact GM and call me back. I'm sure it will go back into the shop for work, just not sure what they'll be doing. This will be the third time in the shop for some sort of repair due to this oil consumption issue. I'll post more when I get some details.

 

 

 

I feel your pain. Thats why I haven't really bothered to go any further. All the band aid jobs they are doing and probably hoping for a give up, trade it in, or pass the 100k mark. 1 member gave some good advice to me months ago, but I didn't have the funds to trade it off.

ZRX631 Enthusiast

ZRX631

Posted
Posted (edited)

2008-5.3 iron block, 60K miles, changed IAW DIC information, usually before it hits 20%. One quart low 3K after last oil change. Checking more frequently now to see what's happening.

Edited by ZRX631
nqabigt Enthusiast

nqabigt

Posted
Posted

2008-5.3 iron block, 60K miles, changed IAW DIC information, usually before it hits 20%. One quart low 3K after last oil change. Checking more frequently now to see what's happening.

 

 

What brand and weight oil ??

ifshinxs Enthusiast

ifshinxs

Posted
Posted (edited)

To the guys going through this Oil consumption deal...I was sceptical as well....After the dealer replaced my pistons and rings along with the oil pan deflector the problem has been fixed. Truck runs like a champ and doesn't use any oil..A good dealer is a must...If your getting the run around find another dealer.

Edited by ifshinnxs
mtiffinal Enthusiast

mtiffinal

Posted
Posted

^^^^

How many miles do you have since the piston and ring replacement? I seriously doubt that the problem is "fixed" unless they have put some re-engineered parts in the motor, specifically referring to the lifters. I was told that my third repair will be what you just had done. I was told each of my last 2 repairs that the problem was "fixed", but obviously it was not. Just my .02 cents.

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    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Can it still be Assembled I?    Stribeck says that we need a certain amount of viscosity under conditions of load and velocity to prevent two surfaces of a know roughness from tearing each other asunder. And we have marketing trying to tell the masses that those two surfaced require less of that commodity due to more exact limits being placed on the same old clearances. We also know that there are limits to how hard something can before it becomes to brittle to be viable and to smooth to 'wet' the surface and that both of those conditions have been known and met since about the Second World War.    That viscosity value shook out at 10 centistokes at 212 F just under a hundred years ago.  Give this a look: [Anton Parr]     What is advertised is the Kinematic viscosity (mm2/s) or that which has been density adjusted but the value we are after is the dynamic viscosity (mPa.s) or true viscosity. You can see that this number is dependent on density thus base stock and temperature. You can also see that an SAE 30 doesn't reach that value in this example. However an SAE 30 that is at the upper end of the SAE 30 range; 12.5 cSt (mm2/s), might. 12.5 * .83 = 10.375 (mm2/s). If you could find an SAE 30 at the upper end these days.   Then there is the complication of viscosity modifiers or VII or VM, whatever you wish to call them. Polymers added to very thin base oils, perhaps 3 to 6 cP oils, that will meet the SAE *W30 spec at 'tested' shear rates and 100 C/212F  target temperature. So a polymer fortified base that is a fraction of the 10 cP requirement Stribeck insist upon.   This could be all well and good if those polymers didn't have two very problematic 'features'. They shear or loose viscosity both 1.) permanently and 2.) temporality. And they do both omitted in the advertised data with the distinct  purpose of deceiving the consumer of the actual operating state of the fluid. I've shown the example of Warren Oils COSTCO 10.91 cSt 5W30 formuation several times where the 100 C HTHS value is 6.9 cP!! That's the temporary shear down and with and SSI or shear stability index of 9.4 cSt. Note the intentional deception in using mixed units?    After a short while that 9.4 cSt oil has a viscosity corrected dynamic value of 7.8 cP. But as the SSI is still within the range of an SAE *W30 whose lower value is 9.3 cSt.    This allows them to continue to call this SAE 16 weight oil a 30 weight, the cake, and still meet the API requirements for fuel efficiency IMPROVEMENT mandated by the EPA. The eating of the cake. By the time you've worn out your motor doing the responsible thing by adhering to the warranty requirements, (the stick), you get deprived of the carrot, wear control. So sad, to bad.   So what can be done? Do I need actually say? [Anton Parr]       Even this must be monitored if the oil is on the low side and the VII an organic or you opt for a 0W40 with an even lighter base oil and more / higher MW VII. (Note the lower density of the 40 weight versus the SAE 30 mono-weight?)    There is another workaround. Temperature. An SAE *W30 run at a bulk temperature of between 180 and 195 F.    Being the belt and suspenders sort I am I do both. Run it cook and run it heavy.    In Part II I'll work the AW package. 
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      By Atlas · Posted

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    • Another JR
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      By Another JR · Posted

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      By newdude · Posted

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