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#4776157 - 06/03/18 09:49 AM Oil for AFM 5.3 GM engine, 2008
steve40th Offline


Registered: 03/15/07
Posts: 100
Loc: Charleston, SC
1. What kind of vehicle you have 2008 Silverado, 5.3 liter AFM flex fuel
2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well. 5W30
3. Where you live, South Carolina
4. How you drive (easy? hard? fast? slow?) easy
5. What your daily drive is like (short trips? long trips? city? highway?) short trips, less than 15 miles twice a day, city
6. Whether your car has any known problems. This engine is known for lifters leaking by after sitting for a few hours, every morning for me, and ticking for a few seconds or longer after initial start up. Engine class is known for oil usage if lifters goes bad.
Mine has done this since I bought it with 92,000 miles. First oil change I used Mobil 1 5w30 DEXOS labeled, and the engine didnt tick till after 4000 miles. No oil usage and plug were fine. I also used AC delco filter with anti drain back filter.
Second and third oil changed I used Pennzoil Full synthetic platinum, or whatever their best stuff is, and the engine started ticking at less than 2000 miles upon start up.
Fourth oil change back to Mobil 1. Currently at 111000 miles.
So, my question is, what makes the oil within Mobil one bottle seem to maintain its integrity longer within my specific engine? Or is their an oil that actually can get into lifters quicker or stay in lifters longer due to the oils recipe. I would like to have oil last longer than 4 or 5 thousand miles in the engine. But if I have to change early, am I wasting money on synthetic.

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#4776164 - 06/03/18 10:01 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1521
Loc: wv
Its a mechanical issue with these engines..cant fix that with oil. Its just a noise and tons of people just get used to it. I have over 230K on my tow rig and it is noisy at startup..til it warms up.

I have used 5w30, 10w30, 5w40 and 10w40 from my oil stash and also tried WIX, ACDelco and Fram filters. Nothing changed in the sound department..

Bottom line is that they are great engines that have poor fuel mileage... So no sense in using high dollar oils.

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#4776169 - 06/03/18 10:11 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: krismoriah72]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: krismoriah72
Bottom line is that they are great engines that have poor fuel mileage... So no sense in using high dollar oils.


I agree.... synthetics are a waste of money unless you are pulling some VERY heavy trailer loads in high heat.
I'd run 10W-40 or 15W-40 in that thing in Texas.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4776181 - 06/03/18 10:25 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
08z06 Offline


Registered: 08/19/17
Posts: 15
Loc: OH
maxlife 1040

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#4776206 - 06/03/18 10:58 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: JohnnyJohnson]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8275
Loc: Illinois
.


Edited by mrsilv04 (06/03/18 11:02 AM)
_________________________
2004 Silverado - on its 3rd Jasper engine in less than one year.

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#4776239 - 06/03/18 11:44 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
Indydriver Offline


Registered: 03/20/11
Posts: 2156
Loc: Indiana
Iíve used all kinds of oil in my 2007 5.3 Flex. At 135,000 miles, it burns a quart plus between oil changes which go 7-8000 miles per the OLM. The best oil Iíve found to reduce consumption is M1 HM which cuts it in half. So I use that unless I have some other oddball stuff to dump. For example, at AZ, they had Pennzoil 10W-30 Pure Platinum jugs on clearance for $10 then $5/ jug. Canít resist that. So, itís running itís first load of this and just needed a quart added at 4,000 miles since OC.


Edited by Indydriver (06/03/18 11:45 AM)
_________________________
2017 Mazda CX3 3000 Mazda Hi Moly
2014 Camaro 2SS/RS LS3 Vert 14,000 M1
2012 Sienna 79,000 M1
2007 Tahoe 140,000 PP


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#4776251 - 06/03/18 12:07 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6185
Loc: USA
Is there an AFMuzzler for these systems like the VCMuzzler that exists for Hondas?

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#4776255 - 06/03/18 12:13 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: slacktide_bitog]
sopususer Offline


Registered: 03/17/11
Posts: 525
Loc: High Country of Western NC
Originally Posted By: slacktide_bitog
Is there an AFMuzzler for these systems like the VCMuzzler that exists for Hondas?


Yes, the Range AFM disabler. Here's their website. Unit can be found for less on Amazon or on other automotive sites.

Range AFM Disabler
_________________________
2017 Subaru Impreza 2.0
QSUD 0W-20/Wix 57055
2017 GMC Sierra Denali 5.3
AC Delco 0W-20/AC PF63E
2017 Subaru Forester 2.5
Idemitsu 0W20/Subaru filter

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#4776354 - 06/03/18 02:57 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
steve40th Offline


Registered: 03/15/07
Posts: 100
Loc: Charleston, SC
Thanks for advice etc everyone. SO, I am fortunate in the ticking noise issue many hear with this motor. The ticking noise only comes on after engine oil is used for some time, as stated in first post. Not when new, so something within the oil additives Mobil One uses is able to last a pretty long time.
I will try HM next time. I think GMs engineers didnt do their homework on the proper lifters or design of this AFM feature.

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#4776466 - 06/03/18 04:30 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
gfh77665 Offline


Registered: 09/01/08
Posts: 3803
Loc: Southeast Texas
I have had great results using straight SAE 30 wt. (and even SAE 40 wt.) in the TX summer. My two Silverados have 160K and 285K.

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#4776541 - 06/03/18 05:52 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
dave1251 Offline


Registered: 07/15/05
Posts: 8675
Loc: Maricopa, AZ
I just used Pennzoil conventional in mine and consumption was almost immeasurable.
_________________________
make the inside of your engine oil cap white.
don't use.

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#4776724 - 06/03/18 09:54 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: Indydriver]
GMguy84 Offline


Registered: 07/14/17
Posts: 250
Loc: OKLAHOMA
Originally Posted By: Indydriver
Iíve used all kinds of oil in my 2007 5.3 Flex. At 135,000 miles, it burns a quart plus between oil changes which go 7-8000 miles per the OLM. The best oil Iíve found to reduce consumption is M1 HM which cuts it in half. So I use that unless I have some other oddball stuff to dump. For example, at AZ, they had Pennzoil 10W-30 Pure Platinum jugs on clearance for $10 then $5/ jug. Canít resist that. So, itís running itís first load of this and just needed a quart added at 4,000 miles since OC.



I have a '01 Suburban 5.3 with 250K miles TX/OK truck all its life that had LOUD piston slap and lifers, I used my "free" stash of M1 HM 10-40 I had and it quited it down alot and now runs VERY smooth !!!


HUGE difference vs other oils I have used in past


Dave
_________________________
05 Silverado Z71 5.3 DELO 400 XLE 10W30/FUG XG3675

01 Suburban 5.3 Mobil 1 HM 10W40/M1206A

1982 TRANS AM (KITT) Mobil Super 5K HM 10W40/M1302A

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#4776835 - 06/04/18 04:19 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
steve40th Offline


Registered: 03/15/07
Posts: 100
Loc: Charleston, SC
Whats in the Mobil 1 HM compared to their regular MObil M1

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#4777058 - 06/04/18 10:02 AM Re: Oil for AFM 5.3 GM engine, 2008 [Re: steve40th]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1521
Loc: wv
mobil 1 HM 10w40 VOA...kinda old but here it is

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/2345322/1

if anything the add pack is weak compared to HDEO 10w30

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#4777556 - 06/04/18 07:00 PM Re: Oil for AFM 5.3 GM engine, 2008 [Re: krismoriah72]
steve40th Offline


Registered: 03/15/07
Posts: 100
Loc: Charleston, SC
Originally Posted By: krismoriah72
mobil 1 HM 10w40 VOA...kinda old but here it is

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/2345322/1

if anything the add pack is weak compared to HDEO 10w30


Interesting, I think conventional oil is pretty good. Compared to oils of 20 years ago, oil keeps getting better, lasts longer, protects better as oil companies keep refining the recipe.

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