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2007 Chev 6.0 L with active fuel management #4780976
06/08/18 06:44 AM
06/08/18 06:44 AM
Joined: Aug 2017
Posts: 6
Ontario Canada
BenM Offline OP
BenM  Offline OP
Joined: Aug 2017
Posts: 6
Ontario Canada
Hello everyone. I have a 2007 chev Silverado with a 6.0 L gas engine. 300,000kms on it. I've recently been told that you can not run a heavier oil in the newer chev engines due to the filter screens for the active fuel management (variable valve timimg valve) plugging or restricting flow. Can anyone confirm this to be true or false. I have been using Mobil 5w30 for a while now but already had to run a cleaner through it once to free up a sticking fuel management valve. I would like to run Rottella 15w40 in mine??

Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4780984
06/08/18 06:59 AM
06/08/18 06:59 AM
Joined: Nov 2008
Posts: 12,728
NH
supton Offline
supton  Offline
Joined: Nov 2008
Posts: 12,728
NH
I can't answer, but I'll ask, why change to 15W40? if 5W30 has been working fine, why change? Is it to get to a common oil?


2011 Toyota Camry, base, 2.5L/6MT, 170k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 144k, ours
1999 Toyota Camry LE, 2.2L/4AT, 195k, his
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781023
06/08/18 07:32 AM
06/08/18 07:32 AM
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Here is what I know.

1. The 6 liter did not come with AFM, so no worries there. Not sure where you are getting your info. The 5.3 and 6.2 did. The 4.8 did not. Take a look at your the top of your air filter box. It will state your engine displacement.
2. The AFM with the 5.3 had real problems with their AFM
3. The AFM problem went away in 2014 with the redesign of the Chev V-8s. The 5.3 and 6.2 became Gen 5 engines with a higher pressure oil pump with an electronically controlled solenoid to allow 60psi pressures at highway speed and 40 psi at low speeds and idling. The AFM was completely redesigned. The 6 liter is still a Gen 4 and does not have the updated oil pump system. Nor does it have AFM.
4.There is an issue with the screen on any of the engines. The screen is right below the oil pressure sensor mounted at the rear drivers side of the top of the block. If that screen plugs, the oil pressure sensor will read 0. I have no knowledge of any other screen other than at the oil pickup.
5.If you want your AFM system to remain healthy in a 2014 onward AFM equipped engine, you need to be running the GM recommended Dexos Oil. This is no place for old school xw40 oil.
6. However, running a xw40 weight in a high mileage 6 liter should not cause problems, in my opinion.

Last edited by Snagglefoot; 06/08/18 07:54 AM.

If you want the job done right......do it yourself.
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781064
06/08/18 08:13 AM
06/08/18 08:13 AM
Joined: May 2002
Posts: 21,067
Oakville, Ontario
Patman Offline
Patman  Offline
Joined: May 2002
Posts: 21,067
Oakville, Ontario
FWIW, the 2019 Corvettes come factory filled with 0w40 now and it has a 6.2 L engine with active fuel management. So GM feels that it's safe to run thicker oils with active fuel management. (they have also stated that they recommend this 0w40 for 2014-2018 Corvetttes too)


2018 Corvette (M1 ESP Formula 5w30 & NAPA Gold)
2006 Civic EX Coupe (PUP 5w20 & Fram Ultra)
2010 BMW 328i X-Drive (GC 0w40 & Fram Ultra)

Re: 2007 Chev 6.0 L with active fuel management [Re: Patman] #4781088
06/08/18 08:45 AM
06/08/18 08:45 AM
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Originally Posted By: Patman
FWIW, the 2019 Corvettes come factory filled with 0w40 now and it has a 6.2 L engine with active fuel management. So GM feels that it's safe to run thicker oils with active fuel management. (they have also stated that they recommend this 0w40 for 2014-2018 Corvetttes too)


You are assuming the AFM system on the LT4 is identical with the lesser engines. Could be but unless I saw proof, I would stick with GM's recommendations for each individual engine.


If you want the job done right......do it yourself.
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781093
06/08/18 08:51 AM
06/08/18 08:51 AM
Joined: May 2005
Posts: 3,483
Alberta, Canada
Smokescreen Offline
Smokescreen  Offline
Joined: May 2005
Posts: 3,483
Alberta, Canada
BenM.....I have 2 words for you BlackBear Performance.

I just had the traditional tune and it woke the truck up in a very noticeable way...yet retains the reliability.


13 Civic Si 2.4L- 69Kkms(43Kmi)-PP,Wix
05 LeSabre 3.8L-210Kkms(134Kmi)-PP,Wix
03 Sierra 2500 6.0L-204Kkms(127Kmi)-PP,Wix

All with mpg > EPA
Re: 2007 Chev 6.0 L with active fuel management [Re: Snagglefoot] #4781133
06/08/18 09:32 AM
06/08/18 09:32 AM
Joined: Oct 2008
Posts: 19,172
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,172
Sunny Florida
Originally Posted By: Snagglefoot
Originally Posted By: Patman
FWIW, the 2019 Corvettes come factory filled with 0w40 now and it has a 6.2 L engine with active fuel management. So GM feels that it's safe to run thicker oils with active fuel management. (they have also stated that they recommend this 0w40 for 2014-2018 Corvetttes too)


You are assuming the AFM system on the LT4 is identical with the lesser engines. Could be but unless I saw proof, I would stick with GM's recommendations for each individual engine.


We went through all this clear back in 04-05 as Chrysler brought MDS to the market.

The simple fact is that virtually all oil controlled cylinder deactivation systems seem to tolerate a very wide spread of viscosity. No downside except incredibly small variations in activation.

Just think about a dead cold 30w oil, it's a LOT thicker than it will be at operating temp. yet they kick in just fine as the engine heats up.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781134
06/08/18 09:32 AM
06/08/18 09:32 AM
Joined: Jan 2013
Posts: 1,672
Wisconsin
WiskyBadger Offline
WiskyBadger  Offline
Joined: Jan 2013
Posts: 1,672
Wisconsin
6.0s do not have AFM as stated in a earlier post. Sounds like someone was trying sell you something. Stick with a 5w30 maybe a HM oil. No reason for a 15w40 in a LS engine. 6.0s are tough engines and have long lives with standard 5w30 bulk oil. We have around 30 in our fleet at work with 0 problems other then manifold bolts breaking, which is common. Most of these engines have 200,000 + miles some 300,000 and one they recently sold had 425,000, all on cheap bulk no name oil from a 55 gallon drum.


14 Buick Verano �Blanche� 61k Castrol Edge & Delco filter
01 Ford Ranger �Rick� 166k Castrol Magnatec Motorcraft
78 Chevy Stepside
11 Chevy Traverse 114k Carquest 5w30 and Carquest filter
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781195
06/08/18 10:19 AM
06/08/18 10:19 AM
Joined: Dec 2014
Posts: 506
MB - Manitoba
FastLane Offline
FastLane  Offline
Joined: Dec 2014
Posts: 506
MB - Manitoba
Just keep using 5W30 or if you want try 10W30. The LS V8's don't need thick oil.


2010 Silverado 4.8 4x4 Mobil 1 5W30 ACDelco PF48E
2002 Mustang GT 4.6 Mobil 1 5W30 MC FL-820S
1966 Cessna 150 Phillips 20W50
2013 Mercury 30hp Mystic 25W40
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781342
06/08/18 01:10 PM
06/08/18 01:10 PM
Joined: Aug 2017
Posts: 6
Ontario Canada
BenM Offline OP
BenM  Offline OP
Joined: Aug 2017
Posts: 6
Ontario Canada
Mine is the 6.0 L MAX in an LTZ Silverado. By active fuel management I mean that the engine at cruising speed will drop to 4 cyls. Maybe it was called something different in 2007???

Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781377
06/08/18 01:44 PM
06/08/18 01:44 PM
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
I think youre right Ben. It was a Vortec and seems to have had a version of AFM. The LS version did not.


If you want the job done right......do it yourself.
Re: 2007 Chev 6.0 L with active fuel management [Re: SteveSRT8] #4781378
06/08/18 01:47 PM
06/08/18 01:47 PM
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Originally Posted By: SteveSRT8
Originally Posted By: Snagglefoot
Originally Posted By: Patman
FWIW, the 2019 Corvettes come factory filled with 0w40 now and it has a 6.2 L engine with active fuel management. So GM feels that it's safe to run thicker oils with active fuel management. (they have also stated that they recommend this 0w40 for 2014-2018 Corvetttes too)


You are assuming the AFM system on the LT4 is identical with the lesser engines. Could be but unless I saw proof, I would stick with GM's recommendations for each individual engine.


We went through all this clear back in 04-05 as Chrysler brought MDS to the market.

The simple fact is that virtually all oil controlled cylinder deactivation systems seem to tolerate a very wide spread of viscosity. No downside except incredibly small variations in activation.

Just think about a dead cold 30w oil, it's a LOT thicker than it will be at operating temp. yet they kick in just fine as the engine heats up.


That conclusion could not have been applied to the pre-2014 GM AFM system simply because it was a disaster. They came from the factory working fine but many of them wiped out their lifters with time. For the redesign, GM asked for Dexos.

Last edited by Snagglefoot; 06/08/18 01:56 PM.

If you want the job done right......do it yourself.
Re: 2007 Chev 6.0 L with active fuel management [Re: BenM] #4781395
06/08/18 02:08 PM
06/08/18 02:08 PM
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,781
SE British Columbia, Canada
Hold it. I have to stop getting drawn into these high viscosity discussions and get back to the Bitoger chant. If they ask for 5w20, use 10w40. Its twice as much and must be better. Bye for now.

Last edited by Snagglefoot; 06/08/18 02:08 PM.

If you want the job done right......do it yourself.

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