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15-40 Oil? #4046433
03/22/16 11:29 PM
03/22/16 11:29 PM
Joined: May 2009
Posts: 268
Arkansas
Honda2003 Offline OP
Honda2003  Offline OP
Joined: May 2009
Posts: 268
Arkansas
Is it ok to run 15-40 oil in my 2001 GMC. It is z71 5.3 4x4 ex cab. I had a mechanic tell that I should run a thinker grade than I currently use. I use 5-30 now. Said he ran SuperTech 15-40 in everything he owns. I've thought about trying it because of my quart or more oil burning during 3000 mile oci. I've actually thought about switching to Delvac 15-40. I currently use Mobil Super 5-30 and used Maxlife 5-30 before that. Bought the truck new and it now has 213,000 miles it.


2001 GMC Extended Cab 5.3L Magnatec 5w-30 Synthetic
2013 Ford Edge Limited Motor Craft Syn
2007 Honda R 4x4 GN4 10W-30
Re: 15-40 Oil? [Re: Honda2003] #4046441
03/22/16 11:54 PM
03/22/16 11:54 PM
Joined: Jan 2016
Posts: 325
TX
mooferz Offline
mooferz  Offline
Joined: Jan 2016
Posts: 325
TX
Keep using 5w-30. I think that's what GMC calls for.

If I were to run a thicker oil, I'd consider using a 5w or 0w-40 instead of 15w-40.
edit: Just noticed the oil burning, 10w30 could be a decent idea.

Last edited by mooferz; 03/23/16 12:08 AM.

2001 Lexus ES300, 235k mi, German Castrol 0w-40, Fram TG8316
1985 BMW R80RT (1L)- M1 15w-50
1993 Volvo 945 Turbo- Rotella T5 10W-30 (CJ-4)
Re: 15-40 Oil? [Re: Honda2003] #4046444
03/22/16 11:58 PM
03/22/16 11:58 PM
Joined: Mar 2008
Posts: 5,963
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,963
South Florida
The 5.3 is a full roller motor. It doesn't need thick. 15W40 will be fine, but I would stick with 5W30 myself.

If you are burning a quart per 3000 miles, switch to 10W30 maxlife, and maybe try their 10W40 if you really want to try a 40 weight.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 Maxlife Syn 5W30
06 GMC Sierra Nextgen 10W30


Re: 15-40 Oil? [Re: Honda2003] #4046459
03/23/16 12:23 AM
03/23/16 12:23 AM
Joined: Oct 2015
Posts: 2,798
Balearic Islands , Spain
FordCapriDriver Online content
FordCapriDriver  Online Content
Joined: Oct 2015
Posts: 2,798
Balearic Islands , Spain
try a 5w40


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.

Finnish expat in Spain.
Re: 15-40 Oil? [Re: Honda2003] #4046488
03/23/16 02:35 AM
03/23/16 02:35 AM
Joined: Dec 2009
Posts: 26,206
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 26,206
Regina, Saskatchewan, Canada
A 15w-40 is certainly acceptable. But, unless the specified 5w-30 is giving you real, tangible concerns, why change? Is your oil pressure low? Is it leaking out and a thicker oil would leak more slowly? Is it consuming oil? Try something like 15w-40 if you wish to address such issues. If you don't have such concerns, you'll be fine with what you're already doing.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 15-40 Oil? [Re: Honda2003] #4046504
03/23/16 03:03 AM
03/23/16 03:03 AM
Joined: Jul 2015
Posts: 4,655
Down Under
SR5 Offline
SR5  Offline
Joined: Jul 2015
Posts: 4,655
Down Under
Nothing wrong with 15W-40, it's probably the most common oil weight in Australia. 15W-40 mineral and 10W-40 semi-synthetic. We run it in everything.

Nothing wrong with a good 5W-30, but if you want to try 15W-40 it's not going to hurt your truck. You could always try it for one oil change and see, if you don't like it go back to 5W-30.


---------------------------------------------------------------------------------
Castrol GTX Ultraclean 15W40 A3/B3 + Wesfil-Cooper Z154
Re: 15-40 Oil? [Re: Honda2003] #4046583
03/23/16 05:53 AM
03/23/16 05:53 AM
Joined: Oct 2010
Posts: 7,097
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,097
Michigan
No. Don't run 15w40. If your problem is oil burning, run M1 High Mileage 10w30 for at least a 6000 mile oil change interval.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: 15-40 Oil? [Re: Honda2003] #4046594
03/23/16 06:04 AM
03/23/16 06:04 AM
Joined: Nov 2004
Posts: 1,854
SD
zrxkawboy Offline
zrxkawboy  Offline
Joined: Nov 2004
Posts: 1,854
SD
You live in AR and are burning oil - you could move up a grade if you want, though staying with 5W30 won't hurt, either. I'm sure 15W40 wouldn't hurt anything, but I might be inclined to try a 10W30 or 10W40 HM oil.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: 15-40 Oil? [Re: Garak] #4046603
03/23/16 06:14 AM
03/23/16 06:14 AM
Joined: Sep 2015
Posts: 165
East Europe
Thebimmerfan Offline
Thebimmerfan  Offline
Joined: Sep 2015
Posts: 165
East Europe
Originally Posted By: Garak
A 15w-40 is certainly acceptable. But, unless the specified 5w-30 is giving you real, tangible concerns, why change? Is your oil pressure low? Is it leaking out and a thicker oil would leak more slowly? Is it consuming oil? Try something like 15w-40 if you wish to address such issues. If you don't have such concerns, you'll be fine with what you're already doing.


Yes, I think he said in the first post that the truck is consuming more than 1 quart in 3000miles.

Re: 15-40 Oil? [Re: Honda2003] #4046622
03/23/16 06:48 AM
03/23/16 06:48 AM
Joined: Dec 2015
Posts: 582
Arkansas
mazdamonky Offline
mazdamonky  Offline
Joined: Dec 2015
Posts: 582
Arkansas
My question is were you burning oil on Maxlife? you were using an HMO which is supposed to help with oil consumption but moved to Mobil super. Maybe try Mobil super High mileage? It can be had here in AR for $15.17 plus tax with a $7 mail in rebate at the time, so I see absolutely no harm in giving it a go. (if you have been using regular mobil super)


2018 mazda3 hatch 2.5 263 miles
1985 rx7 1.1 98k miles
2002 protege 220k miles
1985 rx7 with a 5.0 swap
2002 Protege 299k miles Girlfriend's
4 more running cars in yard not mentioned
Re: 15-40 Oil? [Re: Thebimmerfan] #4046630
03/23/16 06:54 AM
03/23/16 06:54 AM
Joined: Feb 2009
Posts: 1,585
wv
krismoriah72 Offline
krismoriah72  Offline
Joined: Feb 2009
Posts: 1,585
wv
The answer to your question is yes it is ok. I have had two service trucks that were run exclusively on 15w40 before i bought them. One a 5.4 ford and the other a 5.7 chevrolet. If you switch i would run a short cycle of 2500 miles or so at first due to the high detergents of the 15w40, your dipstick will be black from the cleaning.

Re: 15-40 Oil? [Re: Honda2003] #4046633
03/23/16 07:03 AM
03/23/16 07:03 AM
Joined: Dec 2015
Posts: 582
Arkansas
mazdamonky Offline
mazdamonky  Offline
Joined: Dec 2015
Posts: 582
Arkansas
Oh, Also, to answer your question, being here in Arkansas, I would Imagine 15w40 wouldn't hurt at all. Especially during the summer.


2018 mazda3 hatch 2.5 263 miles
1985 rx7 1.1 98k miles
2002 protege 220k miles
1985 rx7 with a 5.0 swap
2002 Protege 299k miles Girlfriend's
4 more running cars in yard not mentioned
Re: 15-40 Oil? [Re: zrxkawboy] #4046658
03/23/16 07:29 AM
03/23/16 07:29 AM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
Boston, MA
Originally Posted By: zrxkawboy
You live in AR and are burning oil - you could move up a grade if you want, though staying with 5W30 won't hurt, either. I'm sure 15W40 wouldn't hurt anything, but I might be inclined to try a 10W30 or 10W40 HM oil.


+1 I worked for a landscape company when I was in college and he used 15w-40 shell in his entire fleet. Gas and diesel. We had an irrigation truck that had 300k on it and still purred like a kitten. Personally I don't see there being any issues but consider switching to a 10w-40 HM like Pennzoil.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: 15-40 Oil? [Re: Thebimmerfan] #4046680
03/23/16 07:49 AM
03/23/16 07:49 AM
Joined: Dec 2009
Posts: 26,206
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 26,206
Regina, Saskatchewan, Canada
Originally Posted By: Thebimmerfan
Yes, I think he said in the first post that the truck is consuming more than 1 quart in 3000miles.

Thanks, don't know how I missed that. It might be worth a try, but that consumption isn't that high. It's on the border of what I'd consider annoying. wink


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 15-40 Oil? [Re: mazdamonky] #4046757
03/23/16 08:55 AM
03/23/16 08:55 AM
Joined: May 2009
Posts: 268
Arkansas
Honda2003 Offline OP
Honda2003  Offline OP
Joined: May 2009
Posts: 268
Arkansas
Yes I was burning oil on Max Life. Quart or more on OCI 3000 miles. I've been on Max Life since 75,000 miles and now have 213,000. I just switched to the Mobil Super High Mileage 2 changes ago. No different than the max life and both 5-30.


2001 GMC Extended Cab 5.3L Magnatec 5w-30 Synthetic
2013 Ford Edge Limited Motor Craft Syn
2007 Honda R 4x4 GN4 10W-30
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