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DEXOS synthetic vs Conventional oil #4686269
03/06/18 01:45 PM
03/06/18 01:45 PM
Joined: May 2011
Posts: 11
NS Canada
Squashtowner Offline OP
Squashtowner  Offline OP
Joined: May 2011
Posts: 11
NS Canada
My 2012 Sierra 5.3 is past warranty. I've used DEXOS oil for every oil change. I now have 113000 km on the truck. I changed the oil when the dash reminder told me to on the driver information center. This has tun 14000 km on a couple instances, and that alarms me.

My new job gives me access to free mobil conventional oil. I've been using purolator filters for the past 2 years, wix prior to that.

Can I switch over to non synthetic and make my oil change interval 5000 km? It'd simplify things a lot for me.

Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686272
03/06/18 01:47 PM
03/06/18 01:47 PM
Joined: Oct 2015
Posts: 2,657
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,657
Balearic Islands , Spain
I would, free oil is very hard to say no to.


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.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686279
03/06/18 01:55 PM
03/06/18 01:55 PM
Joined: May 2011
Posts: 11
NS Canada
Squashtowner Offline OP
Squashtowner  Offline OP
Joined: May 2011
Posts: 11
NS Canada
In my original post I said the truck went 14000 km between oil changes. It was still showing 24% oil life at 14000 km, and I started having oil pressure issues. A fresh oil and filter change fixed it up and I haven't had any issues since. I put a sticker on my windshield to change it at 7500 km since that happened.

Last edited by Squashtowner; 03/06/18 01:56 PM.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686294
03/06/18 02:03 PM
03/06/18 02:03 PM
Joined: Oct 2010
Posts: 1,781
.
Danh Offline
Danh  Offline
Joined: Oct 2010
Posts: 1,781
.
To meet GM’s dexos spec requires at least a synthetic blend and one supposes GM did this for a reason. And the oil life monitor is calibrated for at least a syn blend. Maybe there wouldn’t be short term damage from using a conventional oil but if you do so you may want to shorten the OCI a bit. Personally, I’d stick with the dexos spec.

Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686298
03/06/18 02:14 PM
03/06/18 02:14 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
I think most dealerships use conventional oil in many instances and many Silveradoes still are out there going strong. I wouldn't worry but I would not go over 6,000 kilometers with the oil


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: DEXOS synthetic vs Conventional oil [Re: FermeLaPorte] #4686306
03/06/18 02:21 PM
03/06/18 02:21 PM
Joined: May 2011
Posts: 11
NS Canada
Squashtowner Offline OP
Squashtowner  Offline OP
Joined: May 2011
Posts: 11
NS Canada
I was also thinking that. Plus, the 5w30 here is GF-5 and SN rated. Same as the dexos 5w30 I was using all along. I don't think it would be an issue.

Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686308
03/06/18 02:27 PM
03/06/18 02:27 PM
Joined: May 2009
Posts: 12,192
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,192
N.H, U.S.A.
Dexos spec ain't all that. You just want a good oil. The last oil I ran was Dexos spec full synthetic and it was NG. (Magnatec Full Syn 5w30) Funny, the Magnatec SS ran well.

Got QSUD non DEXOS 10w30 iN THERE last night AND IT IS ALL GOOD AGAIN.

Id run a decent faux or real synthetic you trust. That 5.3 has pretty high power density. It would have been a z28 enhgine in the earl;y 70s if it appeard back then brought by Aliens (who don't exist around HERE at LEAST)


2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686366
03/06/18 03:15 PM
03/06/18 03:15 PM
Joined: Jun 2012
Posts: 678
Reno, NV
redbone3 Offline
redbone3  Offline
Joined: Jun 2012
Posts: 678
Reno, NV
No turbo, no GDI, no problem.


2014 Passat Wolfsburg, 1995 Miata.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686390
03/06/18 03:39 PM
03/06/18 03:39 PM
Joined: Aug 2017
Posts: 538
Nebraska
BJD78 Offline
BJD78  Offline
Joined: Aug 2017
Posts: 538
Nebraska
Free would make that decision fairly easy. Tens of thousands of trucks and other vehicles on the road with 300K plus on the odometer running nothing but straight dino and still going strong


2010 Forester:122K
2009 Sonata :189K
2010 Tucson:55K

OCI 5K using the cheapest dino oil I can buy,usually NAPA or TSC Travelers oil.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686406
03/06/18 03:52 PM
03/06/18 03:52 PM
Joined: Dec 2017
Posts: 2,333
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,333
SE British Columbia, Canada
Don’t forget the 2012, 5.3 had AFM. Chat with some of the AFM victims before you decide on non Dexos oil.


If you want the job done right......do it yourself.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686487
03/06/18 05:14 PM
03/06/18 05:14 PM
Joined: May 2002
Posts: 1,385
St. Charles County, Missouri
csandste Offline
csandste  Offline
Joined: May 2002
Posts: 1,385
St. Charles County, Missouri
I kept using Valvoline Max Life blend after my Encore was out of warranty. Like a previous post said. Turbo and GDI, I'd go with gen II. Turbo only (mine), gen I will do. Neither one, they're just calling for the Dexos because they don't want to stock multiple oils at the dealership.


2017 Kia Soul Plus-- Valvoline MaxLife Blend 5-20, 48,000 miles.
Re: DEXOS synthetic vs Conventional oil [Re: ARCOgraphite] #4686491
03/06/18 05:20 PM
03/06/18 05:20 PM
Joined: Mar 2017
Posts: 5,451
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,451
Soviet State of Washington
Originally Posted By: ARCOgraphite
Dexos spec ain't all that. You just want a good oil. The last oil I ran was Dexos spec full synthetic and it was NG. (Magnatec Full Syn 5w30) Funny, the Magnatec SS ran well.

Got QSUD non DEXOS 10w30 iN THERE last night AND IT IS ALL GOOD AGAIN.

Id run a decent faux or real synthetic you trust. That 5.3 has pretty high power density. It would have been a z28 enhgine in the earl;y 70s if it appeard back then brought by Aliens (who don't exist around HERE at LEAST)




Have you ever found a oil you really liked?


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: DEXOS synthetic vs Conventional oil [Re: ARCOgraphite] #4686504
03/06/18 05:31 PM
03/06/18 05:31 PM
Joined: Apr 2012
Posts: 9,384
Kendall, FL
wemay Offline
wemay  Offline
Joined: Apr 2012
Posts: 9,384
Kendall, FL
Originally Posted By: ARCOgraphite
Dexos spec ain't all that. You just want a good oil. The last oil I ran was Dexos spec full synthetic and it was NG. (Magnatec Full Syn 5w30) Funny, the Magnatec SS ran well.

Got QSUD non DEXOS 10w30 iN THERE last night AND IT IS ALL GOOD AGAIN.

Id run a decent faux or real synthetic you trust. That 5.3 has pretty high power density. It would have been a z28 enhgine in the earl;y 70s if it appeard back then brought by Aliens (who don't exist around HERE at LEAST)


What reason(s) do you give for saying dexos spec 'ain't all that?'

OP,
If your vehicle is out of warranty and isn't DI, i don't think think using the conventional oil would pose a problem.


'18 KIA Sportage LX AWD 2.4L: MSS 10w30
Next: PP 5w20

'13 Hyundai Santa Fe Sport 2.0T: EDGE 5w30
Next: Magnatec 5w30
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686575
03/06/18 06:58 PM
03/06/18 06:58 PM
Joined: Jun 2002
Posts: 19,235
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,235
Iowegia - USA
Originally Posted By: Squashtowner
My 2012 Sierra 5.3 is past warranty. I've used DEXOS oil for every oil change. I now have 113000 km on the truck. I changed the oil when the dash reminder told me to on the driver information center. This has tun 14000 km on a couple instances, and that alarms me.

My new job gives me access to free mobil conventional oil. I've been using purolator filters for the past 2 years, wix prior to that.

Can I switch over to non synthetic and make my oil change interval 5000 km? It'd simplify things a lot for me.


Yes you can but as others have stated, the AFM system requires a clean oil.

If switching I would recommend OCI's based on the Severe Service Schedule.


Reading is fundamental; understanding is not a given ability.
Re: DEXOS synthetic vs Conventional oil [Re: Squashtowner] #4686645
03/06/18 07:48 PM
03/06/18 07:48 PM
Joined: Aug 2010
Posts: 1,025
pa
benjy Offline
benjy  Offline
Joined: Aug 2010
Posts: 1,025
pa
another reason is every label aka spec is $$$$ so GM gets $$$ on every dexos spec oil sold!! as noted change more often, even every 3,000 if its free, cant hurt anything!! my aunts 99 jeep gets 6 month changes with Mobil I HM usually about 2,xxx miles, almost all short trips!!!

Last edited by benjy; 03/06/18 07:51 PM.
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