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RyanbabZ71

Is Your Gmt-900 Truck Or Suv Using Oil

Is your GMT-900 using oil  

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I change my truck every 3000 miles. I also own a 2008 Toyota Sienna and use Conventional and change it at 3000 but I'm going 100 % Synthetic with both vehicles now, 2008 Nissan Altima and I use  Mobil Synthetic  (that's what previous owners used)and change every 5000 and a 2010 Toyota Camry and I use  Valvoline Synthetic (previous owners used Havoline Synthetic) and change every 5000.

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5000 miles on full synthetic with a good premium oil filter will be all you need. 

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^^^ This.

 

I rank additives with "mechanic in a can",  whiz-bang quick fixes. All 1 step below useless ... except for getting you to part with your hard-earned money.

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92,005 miles   Still going Strong 

Burns NO oil  No oil consumption, No SLUDGE..

 Engine Oil stays clean  to 4,000

 

4,000 Mile Oil change interval (±50 miles)

Hybrid Vortec 6.0L LFA Aluminum Engine (LS2 based)

80HP Electric  motor 

:driving:  379HP 472 ft•lb torque combined output 😬

 

she runs a custom blended  mobil1 5w30 (5qt) & Mobil1 0w30 (1qt)

 

  and a steady diet of Mobil or Chevron Fuel,  91 octane only for Maximum Performance

 

 

Piston Style Flat Top, with valve reliefs

 (for VVT duh)

 
Casting Numbers 799, 243
Material Aluminum
Edited by bg1988

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75k miles on my 09 Sierra, no oil burning issues to speak of. Did the valve cover swap, added an oil catch can and got a range afm disabler once I got on this forum and realized how many people were having issues. I figured this is cheap insurance just in case oil consumption did start. I did notice a big oil stain on the block underneath spark plug 1 when I changed my plugs last year, that was before I added the mods stated above. No new stains since. 

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(first post)
Just bought an 07 Silverado with 90k miles on it, gonna be keeping an eye on my dipstick, (specially when hwy driving) and figuring where to get this disabler some of you are talking about., hmmm .... 🤔

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I use Rotella Oil in my 2002 Silverado Ext Cab 4x4 5.3 liter with 121K.

My Dad was original Owner, He always took it to Firestone near his house.

I've had it 3 years now, It "uses" about half a quart over 5k miles.

No leaks that I can see, no Blue/white smoke on start-ups, I don't know where it goes..

Thanks,

Scott 

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It burns it - they all do in varying amounts. 1 quart in 5k miles will never show any evidence, aside from the level drop at oil change time.

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On 12/12/2019 at 9:50 AM, Jsdirt said:

It burns it - they all do in varying amounts. 1 quart in 5k miles will never show any evidence, aside from the level drop at oil change time.

yup, exactly

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On 7/7/2019 at 8:59 PM, Jsdirt said:

That's true of any engine .... but you're missing the point.

 

In their quest to meet EPA regulations (better mileage / emissions), they cut corners on the entire AFM system, and valve train. Low tension piston rings were used to get the mileage they needed ... and in exchange they completely wore out at 50k miles - sometimes less, sometimes more. 

 

I bought my truck brand new. NOBODY has owned it but me since day 1. Forty miles on the clock. It's had a steady diet of top shelf synthetics since 2k miles. Started off with Royal Purple, then switched to Amsoil Signature Series at 40k miles - can't get any better oil than that. Most I've ever run that oil was 9,600 miles. The severe service interval on that oil is 15k miles - the additive package is robust enough to handle that without a problem. I sent my sample into Blackstone Labs, and had high levels of aluminum and iron (piston and rings). Second sample I changed much sooner, and had high levels of brass and iron (camshaft bearings and camshaft). I'm only at 97k now. Started using oil at 50k miles, and oil pressure started trending downwards at around 80k (along with the cam bearing pieces in the oil analysis). When I was a teenager up to my 30's, I abused the CRAP out of my cars and trucks from the 70's & 80's - some I never changed the oil in since they burned, leaked, or did both! NEVER had any sign of engine failure. Well over 200k, some well over 300k, and others we'll never know (maybe 400k to 500k). This truck might look, ride, stop and handle better than those vehicles, but it's a complete piece of shit in comparison. I won't even see 150k before I'll have to put an engine in this thing. Has NOTHING to do with maintenance - it's GM's quest to make money with a failing company.

Im not doubting but I would like links to info on this stuff, and maybe some How-to's or at least what-to as far as the final say on the AFM thing. im at 55k Would a disabler do the trick? I don't really wanna jump in there mechanically yet. 

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