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GM LS High Oil Consumption Fix(s) #5321761 01/13/20 04:21 PM
Joined: Dec 2010
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jetman Offline OP
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Stuck rings is a common problem on many GM LS engines, mine included. I purchased a used 07 GMC Yukon Denali w/6.2L gasoline LS engine w/131k miles. It was consuming a lot of oil, so I installed a catch can in the PCV vacuum line between the valve cover and the intake manifold. It was catching 1 oz of oil every 100 miles. I soon learned that GM offered a new improved driver side valve cover. The PCV is built in to the valve cover. The original vc PCV baffling was a poor design that allowed a lot of oil to be sucked into the engine and burned, eventually sticking the rings.

When doing my home work for this problem, I discovered GM TSB 10-06-01-008M for this problem. To unstick the rings I pulled all my spark plugs, soaked all the combustion chambers with Gunk Motor Medic for 48 hrs, moving a crank back and forth every once in a while with the harmonic balancer bolt. This did the trick. I've since put 20k miles on it and now it consumes 1/2 qt every 8k miles. The catch can catches only 1 oz/8k miles.

For non-mechanic types, Valvoline Premium Blue Restore may be just the ticket.

Here is the GM TSB link: LINK

Here is Valvoline Premium Blue Restore link: file:///C:/Users/donje/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/Valvoline%20Premium%20Blue%20Restore%20Oil%20(7).pdf


Fulltime DIYer, retired pilot
12 MKX 3.7
07 Yukon 6.2
07 Toyota FJ 4.0
96 Prevost XL40 12.7
51 Chevy 5w PU Resto 5.3
92 TopSportsman Firebird w/604
241" 4link Dragster w/565
83 Glasair! TD
90 Ez-Go 2-cysle GC
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321777 01/13/20 04:43 PM
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JohnnyJohnson Offline
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In my opinion no matter what the Stealership say 1 Oz a hundred miles is not acceptable. Worst cast scenario my Toyota goes through less than 16 Oz. in over 7,000 miles. The BS just keeps coming!


2004 Corolla 138491
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77060
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321855 01/13/20 06:03 PM
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benjy Offline
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as usual big $$$$ GM gets away free. gilrfriends oil drinkin 2.5L 2013 malibu was using a qt in less than a thou, traded that POS!! only 60 thou on it NO more GM junk!!

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321863 01/13/20 06:09 PM
Joined: Aug 2018
Posts: 1,047
RDY4WAR Online Content
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Originally Posted by jetman
Stuck rings is a common problem on many GM LS engines, mine included. I purchased a used 07 GMC Yukon Denali w/6.2L gasoline LS engine w/131k miles. It was consuming a lot of oil, so I installed a catch can in the PCV vacuum line between the valve cover and the intake manifold. It was catching 1 oz of oil every 100 miles. I soon learned that GM offered a new improved driver side valve cover. The PCV is built in to the valve cover. The original vc PCV baffling was a poor design that allowed a lot of oil to be sucked into the engine and burned, eventually sticking the rings.

When doing my home work for this problem, I discovered GM TSB 10-06-01-008M for this problem. To unstick the rings I pulled all my spark plugs, soaked all the combustion chambers with Gunk Motor Medic for 48 hrs, moving a crank back and forth every once in a while with the harmonic balancer bolt. This did the trick. I've since put 20k miles on it and now it consumes 1/2 qt every 8k miles. The catch can catches only 1 oz/8k miles.

For non-mechanic types, Valvoline Premium Blue Restore may be just the ticket.

Here is the GM TSB link: LINK

Here is Valvoline Premium Blue Restore link: file:///C:/Users/donje/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/Valvoline%20Premium%20Blue%20Restore%20Oil%20(7).pdf


I'll have to give that a try. My 2002 Tahoe LS 5.3L uses some oil, but not much. I have to add a quart every 5-6k miles. I have a catch can on there, but it hardly catches anything at all. I'm not losing it externally so it has to be going past the rings. I'm going to change the plugs on it this coming weekend in preparation for a road trip at the end of the month. I might do that motor medic trick and let it sit overnight. Thanks for the tip.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321896 01/13/20 06:40 PM
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Blue_Streak Offline
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In my 6.0L, I've used HDEO for the majority of the oil changes and it has never had an oil consumption problem. At 120k miles I'm using 1/2 qt between 8k changes; I consider that normal. My theory is that the extra detergents and soot emulsifiers help prevent rings from sticking, especially in the de-ac cylinders.

Just throwing a data point out there.

Re: GM LS High Oil Consumption Fix(s) [Re: benjy] #5321945 01/13/20 07:19 PM
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4WD Online Confused
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Got anything new ?

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321951 01/13/20 07:29 PM
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P10crew Online Content
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My son used to work at our local chev dealer. He said they did hundreds of those 5.3 tsb’s. And a lot of them ended up with new motors.

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321956 01/13/20 07:35 PM
Joined: Sep 2010
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4WD Online Confused
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I have had at least one for the last 20 years … none consumed oil. None.

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321962 01/13/20 07:42 PM
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LeakySeals Offline
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Thanks!


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5321975 01/13/20 08:03 PM
Joined: Feb 2019
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P10crew Online Content
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Part number is listed in the tsb.
4wd I keep and old beater truck that I drive to work normal daily driver and then I usually keep a new gm truck under roof. Other than my new 6.0 I haven’t owned an LS daily driver. My good truck before the 6.0 was a duramax. My babe drove a few suburban ls with no issues ever. I think there is a ton of people out there that don’t maintain their stuff and those are probably the ones that we read about. Lots of experience with the LS platform in hot rods with zero trouble and as far as I am concerned the ls platform is probably one of gm’s finest designs.
Btw I just took a ride in a 550 hp/tq LSA this afternoon.
Wild.

Re: GM LS High Oil Consumption Fix(s) [Re: P10crew] #5321980 01/13/20 08:07 PM
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One of the best of any …

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5322050 01/13/20 09:21 PM
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DaleRider Online Content
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The only time my '03 Silverado with the 5.3L ever burned oil was when I used M1 AFE, 0W-30, in her. Saw that and next oil change went back to a 5W-30 and the oil consumption quit. The truck has 188K on her. [censored] fine vehicle overall.

Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5322066 01/13/20 09:40 PM
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clinebarger Online Content
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Your 2007 L92 has a AFM oil pressure relief valve in the oil pan, Even though it doesn't have any other AFM hardware. The relief valve pops off quite a bit & douses #7 & #8 cylinders with oil.

Very early 2007 L92's that were built in 2006 actually had all the AFM hardware but was never enabled in the ECM software.

I recommend dropping the pan, Removing the relief valve & plugging the hole if you want long term success with your ring pack cleaning.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5322176 01/14/20 05:28 AM
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NYEngineer Offline
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My 09 Suburban didn't use a lot of oil but it used some. Enough to bother me. I use an AFM disabler, a catch can and I put the shield in the oil pan that prevents the excess oil from getting on the cylinder walls of 7 and 8. Works well enough. Later this year, I'm going to teach my son how to build an engine so we're going to do a 5.3 with no afm and program it out of the computer.

My brother's 07 Tahoe ate a cam when an AFM lifter collapsed. My dad's 11 Tahoe is trouble free. It has all the AFM band aids in place. I have two friends with pickups that don't take care of them like we do and they both got new engines from chevy.

Clinebarger, we spoke in the past about the parts to do a non AFM 5.3. I still have the list. You really stand by plugging the passage in the pan and using the lesser volume oil pump. Not that I value another opinion more than yours but it's different so I'm inclined to ask... I forgot who it was exactly but some famous engine builder said to do everything else but then use the AFM oil pump and not plug the passage and make sure you use the shield. Kinda doesn't make sense to me. I would think plugging is better.

Last edited by NYEngineer; 01/14/20 05:33 AM.
Re: GM LS High Oil Consumption Fix(s) [Re: jetman] #5322177 01/14/20 05:33 AM
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Railrust Offline
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Well, I can tell you right now, the newer direct injected 5.3 (2015-2018) not only consumes oil, but is also known for fuel injector failures. Having fun with that right now. Yay me! 45,000 miles, not even two years old yet and I need injectors. Did a little search and YES, it is a common issue, and NO, GM does not cover it past the 3/36...it's not covered under my 5/60 drive train. $2,000 dollar repair...for ONE injector.

But as far as oil consumption - that started from day one - use maybe 1/2 to 1 quart in 5,000 mile intervals.

I have a pretty big decision to make, fix it myself and sell it. Or fix it myself and keep it (then hope I won't have any troubles for a while). I'll probably keep it, but I'm keeping a real close eye on this thing going forward. Well maintained, babied, highway miles. Two years old in April...problems so far...starter, fuel injector, chevy shake, frame rust, weird noises coming from behind the dash, misfires, and a transmission that doesn't seem to have a single idea of what gear to be in (so it just shifts back and forth every two seconds).


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
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