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dexos 1 vs dexos 2 #5274151 11/22/19 02:33 AM
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avi1777 Offline OP
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can please someone explain the difference?
it was once said that that the dexos 2 was for diesel but its not really only for it,in europe they recommend it,in the states with the new corvette as well,
i go to any companys oil selector and they recommend dexos 1 but also the 2(mazda cx5 g).
so my question is basically what to use,i understood that the the 2 is more robust then the 1,what else is the difference,and if its for a familiy car will there be any benefit with one over the other?can there be a downside or even worse when using the 2 over the1? doind mostly very short city trips.
tnx a lot.

Re: dexos 1 vs dexos 2 [Re: avi1777] #5274158 11/22/19 03:09 AM
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Petropolymers Offline
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Dexos 2 is a lower ash engine oil for vehicles with diesel particulate filters. It uses ACEA C3 (0.8% max ash) as the basis with some additional GM specific demands. The other key difference is that the fluid (because of ACEA C3) must have a HTHS (high temperature high shear) viscosity of greater than 3.5 cP as opposed to Dexos 1 which is greater than 2.9 cP. The lower the HTHS value the lower the fuel consumption - at least in idealised laboratory conditions. Higher HTHS values help with the higher compression and larger detonation pressure in diesel combustion.

With the exception of turbo gasoline direct injection vehicles it would be pretty safe to use Dexos 2 in place of Dexos 1. In Australia, General Motors Holden, recommends Dexos 1 in all gasoline/petrol engines but it is mandatory for all turbo charged gasoline direct injection engines where LSPI (low speed pre-ignition) is a potential issue. Dexos 2 is allowed (optional) in all non-turbo gasoline engines according to General Motors Holden. Most Dexos 2 formulations will meet/exceed API SN but may not (almost certainly won't) meet API SN Plus for LSPI protection.

Dexos 2 is also in 5W-40 viscosity grading and is in fact mandatory in some GM Diesels (from VM Motori in Italy). You will not find a 0W-20 Dexos 2 fluid due to the high HTHS requirement.

If the engine is a turbo gasoline direct injection engine vehicle, I would use Dexos 1 Gen 2 otherwise Dexos 2 should be fine.

Re: dexos 1 vs dexos 2 [Re: avi1777] #5274159 11/22/19 03:11 AM
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Char Baby Offline
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I believe that dexos 2 is still for diesel engines however, you(we) can use diesel motor oil in gasoline engines but not gasoline motor oils(not robust enough) in diesel engines. Not sure if I said that correctly!

Last edited by Char Baby; 11/22/19 03:12 AM.

"Retired"
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Re: dexos 1 vs dexos 2 [Re: Petropolymers] #5274174 11/22/19 04:39 AM
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avi1777 Offline OP
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Originally Posted by Petropolymers
Dexos 2 is a lower ash engine oil for vehicles with diesel particulate filters. It uses ACEA C3 (0.8% max ash) as the basis with some additional GM specific demands. The other key difference is that the fluid (because of ACEA C3) must have a HTHS (high temperature high shear) viscosity of greater than 3.5 cP as opposed to Dexos 1 which is greater than 2.9 cP. The lower the HTHS value the lower the fuel consumption - at least in idealised laboratory conditions. Higher HTHS values help with the higher compression and larger detonation pressure in diesel combustion.

With the exception of turbo gasoline direct injection vehicles it would be pretty safe to use Dexos 2 in place of Dexos 1. In Australia, General Motors Holden, recommends Dexos 1 in all gasoline/petrol engines but it is mandatory for all turbo charged gasoline direct injection engines where LSPI (low speed pre-ignition) is a potential issue. Dexos 2 is allowed (optional) in all non-turbo gasoline engines according to General Motors Holden. Most Dexos 2 formulations will meet/exceed API SN but may not (almost certainly won't) meet API SN Plus for LSPI protection.

Dexos 2 is also in 5W-40 viscosity grading and is in fact mandatory in some GM Diesels (from VM Motori in Italy). You will not find a 0W-20 Dexos 2 fluid due to the high HTHS requirement.

If the engine is a turbo gasoline direct injection engine vehicle, I would use Dexos 1 Gen 2 otherwise Dexos 2 should be fine.

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Re: dexos 1 vs dexos 2 [Re: avi1777] #5274193 11/22/19 05:43 AM
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Rat407 Offline
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Not to throw a wrench in this but there is now a dexosD for the new Duramax in the 1500 pickups and it calls for a 0w-20.


2002 Silverado 5.3 0w-20 AMSOIL
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274197 11/22/19 06:05 AM
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ka9mnx Offline
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With a compression ratio of 14:1 you would want the higher HTHS of dexos 2.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274198 11/22/19 06:06 AM
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Mad_Hatter Offline
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Originally Posted by avi1777

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Well, it sounds like you have the solution... you just need the problem. crzy

(you're waaay overthinking this. use what your owners manual says, more than likely a pcmo, and move on to something else worthy of your time)

Re: dexos 1 vs dexos 2 [Re: Mad_Hatter] #5274214 11/22/19 06:34 AM
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avi1777 Offline OP
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Originally Posted by Mad_Hatter
Originally Posted by avi1777

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Well, it sounds like you have the solution... you just need the problem. crzy

(you're waaay overthinking this. use what your owners manual says, more than likely a pcmo, and move on to something else worthy of your time)

like all the people on this site-)
my question was can i or is it better in a way to use the d2 over the1.
of course the car will be fine even with con oil but this site is for people who seeks the best or at least want to be educated about oil.

Re: dexos 1 vs dexos 2 [Re: Mad_Hatter] #5274220 11/22/19 06:48 AM
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PimTac Offline
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Originally Posted by Mad_Hatter
Originally Posted by avi1777

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Well, it sounds like you have the solution... you just need the problem. crzy

(you're waaay overthinking this. use what your owners manual says, more than likely a pcmo, and move on to something else worthy of your time)




You have to realize MH that he has been asking the same question over and over in various forms for some time now.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: dexos 1 vs dexos 2 [Re: PimTac] #5274235 11/22/19 07:06 AM
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avi1777 Offline OP
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Originally Posted by PimTac
Originally Posted by Mad_Hatter
Originally Posted by avi1777

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Well, it sounds like you have the solution... you just need the problem. crzy

(you're waaay overthinking this. use what your owners manual says, more than likely a pcmo, and move on to something else worthy of your time)




You have to realize MH that he has been asking the same question over and over in various forms for some time now.

never asked about d1 vs2 dont be a hater

Last edited by avi1777; 11/22/19 07:07 AM.
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274236 11/22/19 07:07 AM
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PimTac Offline
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And that is why I have this person on ignore.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274243 11/22/19 07:14 AM
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avi1777 Offline OP
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tnx for the ignore tip oilburner

Last edited by avi1777; 11/22/19 07:17 AM.
Re: dexos 1 vs dexos 2 [Re: PimTac] #5274250 11/22/19 07:28 AM
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Mad_Hatter Offline
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Originally Posted by avi1777
like all the people on this site-)
my question was can i or is it better in a way to use the d2 over the1.
of course the car will be fine even with con oil but this site is for people who seeks the best or at least want to be educated about oil.

Right and i just educated you in what purpose your owners manual serves. It was literally written by the guys who designed your engine...do you seriously think you know better than they in re to what lube to use?

Sorry you didn't like my answer but I think people put forth some really silly questions..like, "does wearing pink bunny slippers while changing the oil in my neighbors friends sisters cousins driveway, guarantee the right rear tire pressure is correct?"😂... I stand by what I said. Your owners manual already answers your question, deviate from it at your own peril.

Originally Posted by PimTac

You have to realize MH that he has been asking the same question over and over in various forms for some time now.

Yeah, I see that. He's been on the Motul bandwagon for a bit, extolling the virtues of that lube, now it seems that love affair has run it's course. 😂

Last edited by Mad_Hatter; 11/22/19 07:28 AM.
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274255 11/22/19 07:35 AM
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OilReport99 Offline
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Originally Posted by avi1777
Originally Posted by PimTac
Originally Posted by Mad_Hatter
Originally Posted by avi1777

tnk u for your answer,nice one.
my 2.5 non turbo skyactiv engine has relatively high compression of 14.1 i think,should i use the 1 or 2?
i know it will be ok with both but i like to use the best option not the ok one.
tnk u very much.

Well, it sounds like you have the solution... you just need the problem. crzy

(you're waaay overthinking this. use what your owners manual says, more than likely a pcmo, and move on to something else worthy of your time)




You have to realize MH that he has been asking the same question over and over in various forms for some time now.

never asked about d1 vs2 dont be a hater


That’s irrelevant. You’ve asked so many times if Spec/Oil A is better than Spec/Oil B for your engine that people here lose interest in the questions. Every time the answer seems to be “read the manual” - and then you come up with another comparison.

Wish you good luck finding the magic lube.


Last edited by OilReport99; 11/22/19 07:41 AM.

2018 Ram 1500 5.7 17k - VME 5W-20
2018 Camry 2.5 13K - TGMO 0W-16
2007 Impala 3.5 145k - M1EP 5W-30
Re: dexos 1 vs dexos 2 [Re: avi1777] #5274269 11/22/19 07:51 AM
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WyrTwister Offline
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We have a 2015 Chevy Sonic 1.8l NA MPFI car that says DEXOS . As long as the oil container says DEXOS , I look for the best pricing .


Wyr
God bless
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