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#3255417 - 01/21/14 06:08 PM Delvac in a gasser?
renegade_987 Offline


Registered: 04/07/11
Posts: 1551
Loc: Ankeny, IA
Hey guys, today I kindly received 2 gallons of Mobil Delvac 15w40 from a guy at work who recently sold his Duramax. I was wondering if it was ok to use 15w40 in the F150 (summer only) that specs 5w20? I've used 30w without a problem plenty of times but 15w40 almost seems too thick. Any opinions?
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2003 Mustang GT Mobil 1/Motorcraft



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#3255425 - 01/21/14 06:12 PM Re: Delvac in a gasser? [Re: renegade_987]
Eddie Offline


Registered: 12/07/03
Posts: 8695
Loc: Florida, Cape Coral
Yes it is too thick. Maybe you could add a quart at each oil change to the correct recomended oil?
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#3255439 - 01/21/14 06:19 PM Re: Delvac in a gasser? [Re: renegade_987]
Bandito440 Offline


Registered: 02/13/12
Posts: 3661
Loc: NYS
It's thicker than recommended, but won't hurt anything. Mix it 50/50 with 5w-20 if you really want, but I wouldn't worry about it. Just run it in the summer.
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#3255457 - 01/21/14 06:28 PM Re: Delvac in a gasser? [Re: renegade_987]
Ramblejam Offline


Registered: 11/05/13
Posts: 3137
Loc: Kentucky
For a late spring to early fall OCI, you'll be completely fine (I say this as a F-150 owner, and someone that's researched the issue) -- just make sure to report back on your experience.

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#3255459 - 01/21/14 06:30 PM Re: Delvac in a gasser? [Re: Ramblejam]
renegade_987 Offline


Registered: 04/07/11
Posts: 1551
Loc: Ankeny, IA
Originally Posted By: Ramblejam
For a late springto early fall OCI, you'll be completely fine (I say this as a F-150 owner, and someone that's researched the issue) -- just make sure to report back on your experience.


I will report back, and I'll also get a UOA through Blackstone to compare wear and breakdown VS a 5w20
_________________________
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2003 Mustang GT Mobil 1/Motorcraft



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#3255464 - 01/21/14 06:33 PM Re: Delvac in a gasser? [Re: renegade_987]
aquariuscsm Offline


Registered: 12/30/06
Posts: 15518
Loc: South Texas,USA
Originally Posted By: renegade_987
Originally Posted By: Ramblejam
For a late springto early fall OCI, you'll be completely fine (I say this as a F-150 owner, and someone that's researched the issue) -- just make sure to report back on your experience.


I will report back, and I'll also get a UOA through Blackstone to compare wear and breakdown VS a 5w20


I'd love to see that comparison. That'd be really interesting!
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#3255466 - 01/21/14 06:33 PM Re: Delvac in a gasser? [Re: renegade_987]
Ramblejam Offline


Registered: 11/05/13
Posts: 3137
Loc: Kentucky
Originally Posted By: renegade_987
I will report back, and I'll also get a UOA through Blackstone to compare wear and breakdown VS a 5w20


Awesome! Is your '04 the "classic", or new(er) model? Have you posted any analysis results yet?

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#3255473 - 01/21/14 06:36 PM Re: Delvac in a gasser? [Re: Ramblejam]
renegade_987 Offline


Registered: 04/07/11
Posts: 1551
Loc: Ankeny, IA
Originally Posted By: Ramblejam
Originally Posted By: renegade_987
I will report back, and I'll also get a UOA through Blackstone to compare wear and breakdown VS a 5w20


Awesome! Is your '04 the "classic", or new(er) model? Have you posted any analysis results yet?



Its the newer model. I haven't done any UOA's on it yet, but I'll run both tests for the same amount of time in roughly the same driving styles (70% City 30% Highway)
_________________________
2015 VW Jetta 1.8t Dealer/Dealer
2004 F150 189K Valvoline WB/Motorcraft FL-820S
2003 Mustang GT Mobil 1/Motorcraft



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#3255475 - 01/21/14 06:37 PM Re: Delvac in a gasser? [Re: renegade_987]
GutsyGecko Offline


Registered: 08/16/12
Posts: 426
Loc: Youngstown, OH
It's fine. I run a 15w-50 in my 4.6 2V in the summer months for track use. Just let it warm an extra 15 seconds.

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#3255499 - 01/21/14 06:53 PM Re: Delvac in a gasser? [Re: GutsyGecko]
aquariuscsm Offline


Registered: 12/30/06
Posts: 15518
Loc: South Texas,USA
Originally Posted By: GutsyGecko
It's fine. I run a 15w-50 in my 4.6 2V in the summer months for track use. Just let it warm an extra 15 seconds.


M1 15W50?
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

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#3255528 - 01/21/14 07:08 PM Re: Delvac in a gasser? [Re: renegade_987]
Clevy Offline


Registered: 11/11/10
Posts: 9783
Loc: Saskatoon canada
Going from a 20 grade to a 40 grade you're going to not in the engine feeling sluggish. I have in every mod motor I've ever owned.
I used to be a thicker is better guy and I loved syn 5w-40. Once I got over my aversion to 20 grades I instantly noticed the engines had more pep.
Going thicker isn't going to do any harm,especially in the summer and as a bitoger we love free oil.
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2006 Charger RT
Miles x 2 per oil filter

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#3255551 - 01/21/14 07:17 PM Re: Delvac in a gasser? [Re: renegade_987]
BobsArmory Offline


Registered: 03/28/10
Posts: 1120
Loc: Michigan
My father has run various 15w-40 HDEO in his Suburban for 370,000 miles. and so far hasn't had one issue with the engine.
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#3255553 - 01/21/14 07:18 PM Re: Delvac in a gasser? [Re: renegade_987]
glxpassat Offline


Registered: 02/08/04
Posts: 1107
Loc: Huntsville, AL
Take it to Auto zone and tell them it's not being used any longer and they'll probably let you trade it.

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#3255561 - 01/21/14 07:21 PM Re: Delvac in a gasser? [Re: renegade_987]
95busa Offline


Registered: 10/15/05
Posts: 1249
Loc: Tennessee
Bad idea if it is a vct engine. Ohc + vct (which is operated by engine oil) is a bad combination for too heavy oil. Spec is 5w20. Maybe go 5w30. I have two 5.4 fords and run nothing but 5w20. JMHO.
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#3255574 - 01/21/14 07:26 PM Re: Delvac in a gasser? [Re: 95busa]
Clevy Offline


Registered: 11/11/10
Posts: 9783
Loc: Saskatoon canada
Originally Posted By: 95busa
Bad idea if it is a vct engine. Ohc + vct (which is operated by engine oil) is a bad combination for too heavy oil. Spec is 5w20. Maybe go 5w30. I have two 5.4 fords and run nothing but 5w20. JMHO.


Thicker oil slows down the vct systems engagement by milliseconds,so little its imperceptible.
Only applies if the truck is a 3v anyways. If its a 2v they don't have cam phasers.
Thicker oil won't cause any harm but it will make the engine feel sluggish until the engine is hot and even then you'll still notice it at part throttle.
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2006 Charger RT
Miles x 2 per oil filter

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