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#2281149 - 06/06/11 10:20 PM 20W50 in a 6.0 Vortec
mobilaltima Offline


Registered: 02/03/11
Posts: 594
Loc: Golden Meadow, LA
my buddie's dad drives a 2001 2500HD chevy with the 6.0, i asked him the other day what kind of oil he runs in it. he says 20W50, i thought he was joking but he says hes serious. the truck is closing in on 200,000 miles and runs fine. what would be the negative and positive aspects of running 20W50 in it?
_________________________
2006 2500 Dodge 5.9 Cummins CR, Mobil Delvac 15W40, Fleetguard Stratapore, building it for 650 hp

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#2281151 - 06/06/11 10:23 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
steve20 Online   content


Registered: 06/19/07
Posts: 3149
Loc: Morris County NJ
I would think he's probably wasted a couple of hundred dollars in gas over the 200 K miles he's driven, due to increased frictional losses of the heavy oil.
Pros: can't think of any
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427 Chevy Powered

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#2281167 - 06/06/11 10:33 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
tinmanSC Offline


Registered: 09/07/10
Posts: 2059
Loc: Oswego, IL
I really can't think of any benefits. I can think of a new negative effects... fuel efficiency, harder to find oil, harder starts, Is 20w-50 part of the API service spec for this engine?
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Cost of Hobby=2L
(Where L=Cost of Lubricant)
95 Lexus SC300 5-spd@200K, 2000 GS300@125K both VML Full Syn+Purolator PSL20195(soon to be Wix)

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#2281172 - 06/06/11 10:39 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
Lead Shoes Online   content


Registered: 03/03/10
Posts: 2394
Loc: Mn
Wow... 20w50... that's quite a bit thicker than the more than likely 10w30 its supposed to run..
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1992 BMW 325i M50b25 w/Dinan I/E/Chip 161k
M1 0w40/Mahle

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#2281181 - 06/06/11 10:45 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
mobilaltima Offline


Registered: 02/03/11
Posts: 594
Loc: Golden Meadow, LA
i think its 5W30 the recommended viscosity for the 6.0. i tried to tell him it isnt doing any good by running the 20W50 but he doesnt really care lol
_________________________
2006 2500 Dodge 5.9 Cummins CR, Mobil Delvac 15W40, Fleetguard Stratapore, building it for 650 hp

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#2281185 - 06/06/11 10:51 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
jdog Offline


Registered: 11/09/08
Posts: 105
Loc: tx
my dad also has a 2500 hd with the 6.0 v8 all he has ever used is 5w30 castrol edge it uses no oil and he has had some heavy loads that he has pulled it runs great mpg is not that good though

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#2281207 - 06/06/11 11:18 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
Originally Posted By: mobilaltima
i think its 5W30 the recommended viscosity for the 6.0. i tried to tell him it isnt doing any good by running the 20W50 but he doesnt really care lol
He seems to be not doing any bad. 20w-50 in louisanas temps makes the 20w part fine.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#2281241 - 06/07/11 01:11 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
EricF Offline


Registered: 07/14/09
Posts: 1624
Loc: SF Bay Area
I embarassed a shadetree mechanic last weekend.. the customer came in to pay for oil for the 6.0L Yukon.
the mechanic, which I've dealt with before shows up with mobil special 20w50 and a bottle of lucas oil sludge, and a protec (wix B filter) and to top it off.. STP Gas treatment (which is [censored]).

I got caught rolling my eyes. the customer asks me what the problem was and I said nothing. Just that engine shouldn't be running such a thick oil, especially with the lucas. and I explained what it really way. the mechanic comes back and the customer questions him and we get into a debate.
in the end.. I'm not the mechanic. I said, no.. but you're putting a 140wt oil thickener with 20w50 oil in an engine that wants to see 5w30. the customer looks at the mechanic and the only response was.. there's 104,000 miles.
the customer tells me that he's very good and has a great reputation within the community. and I said.. that's good for you then.
_________________________
1993 Ford Ranger XLT 4.0L 4x4 (240k) 5W-30 Synpower
2006 Saturn Relay-3 3.5L (85k) 5W-30 Synpower
2012 Ford Fusion SE 2.5L (39k) 5W20 M/C Semi Syn

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#2281279 - 06/07/11 05:22 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
ahoier Offline


Registered: 02/03/10
Posts: 1720
Loc: Cocoa, FL
yea, it amazes me how many people are still running heavy weight oils, ontop of STP Oil Treatment, or Lucas Oil Thickener, in say, a Toyota Prius!

One time I went to one of these Pennzoil Quick Lube joints, self-standing in a gas station parking lot, etc....it's own covered/single-garage building, and all the dude had on tap was 10W-30 and 20W-50......I was like dude really? This is 2010 (at the time), most vehicles are specing 5W-30......and then he tries lecturing me about the "heat" being so bad here in FL, all cars needs 10W-30.....etc, lol.

And this guy is allegedly "ASE Certified" (at least the logo is on his building, and on his [censored]....).


Edited by ahoier (06/07/11 05:24 AM)

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#2281340 - 06/07/11 07:28 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
A_Harman Offline


Registered: 10/01/10
Posts: 4698
Loc: Michigan
Mostly, he's wasting gas.
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

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#2281425 - 06/07/11 08:49 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
addyguy Offline


Registered: 09/08/05
Posts: 13483
Loc: Canada
In the US south, it ain't gonna do much harm. Big-inch Chevy's seem to not mind thick oil.
_________________________
2003 Mazda Tribute LX V-6, 179k miles.
Castrol Edge SPT 0W-20; Fram EG2.

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#2281434 - 06/07/11 08:55 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
ericthepig Offline


Registered: 12/26/06
Posts: 1648
Loc: Little Rock, AR
STP use to be all the rage back in the 70's. And had those way cool car stickers. I used it in the late 70's and early 80's in a couple of Subarus. Poured like molasses - which back then I thought was a good thing.
_________________________
'06 Mazda 6 (97k) - Pennz YB 5w20 for summer (1 filter/yr)
'98 Sienna - (87k) - Pennz YB 5w30 1 yr OCI (but only ~5k miles)

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#2281987 - 06/07/11 08:56 PM Re: 20W50 in a 6.0 Vortec [Re: ahoier]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
Originally Posted By: ahoier
yea, it amazes me how many people are still running heavy weight oils, ontop of STP Oil Treatment, or Lucas Oil Thickener, in say, a Toyota Prius!

One time I went to one of these Pennzoil Quick Lube joints, self-standing in a gas station parking lot, etc....it's own covered/single-garage building, and all the dude had on tap was 10W-30 and 20W-50......I was like dude really? This is 2010 (at the time), most vehicles are specing 5W-30......and then he tries lecturing me about the "heat" being so bad here in FL, all cars needs 10W-30.....etc, lol.

And this guy is allegedly "ASE Certified" (at least the logo is on his building, and on his [censored]....).
Maybe the mechanic may know more about engines and oils than lets say a sales associate. You know just from years of working on engines and seeing the insides of many engines. Just thinking.
_________________________
Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#2282003 - 06/07/11 09:09 PM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
Torino Offline


Registered: 12/01/04
Posts: 725
Loc: Henderson, Nevada
Well, I use Mobil 1 20-50 in an old Cadillac El Dorado with the 4.5 engine. My gas mileage does'nt suffer noticeably. Those old Cad engines suffer from a front main bearing knock (built in) which is not life threatening. But, the heavier oil sure quiets them down. John--Las Vegas.

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#2282139 - 06/08/11 12:57 AM Re: 20W50 in a 6.0 Vortec [Re: mobilaltima]
chevman4life Offline


Registered: 05/18/11
Posts: 196
Loc: TX
Can't imagine 20W50 unless it has some serious issues. I've used 10w40 in my old Chevy for years and have not seen any loos in economy, but hey it has 207k. I also use 1/2 qt of the Lucas at every change. Old 305 never uses a drop of oil. My wifes Mustang would burn a little oil getting close to the 6k mark on the oil, using 5w30, then went to 10w30 Amsoil and at 10k, level was full. But I'm in Texas where as of now, its 102 during the day. Thick oil vs. thinner, I see pro's and con's but it mainly boils down to personal preference. If you take care of your car, change the oil, whether thin or thick oil, it will last.
_________________________
1982 Chevy C10, 210k
1988 Buick Estate Wagon
1996 E300D, 177k
2005 Ford Mustang V6, 104k, Amsoil 10W30
2010 Ram 1500 HEMI, 83k, Amsoil 0W30

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