[LAST_GEN_1LE]

Excellent video man, thank you!

[Capricio]

Originally Posted by haggler

There is a oil spec called HTHS (high temp high shear) which dexos2 5w30 has a min value of 3.5. This value is inversely related to fuel efficiency. the 5w30 dex1g3 has a value of 3.0. Street cars are prescribed Dex1g3. The higher value will be better for performance engines driven hard.
GM never had a "performance" spec oil until they branded DexosR, before that they were just using Dexos2 which is for gas/diesel with low sulphur and ash (SAPS) with the previously mentioned higher min HTHS value. Basically dexos2 has a higher bar to meet than dexos1. Realisitically for street driving you could run any dexos1/2 5w30. For track any Dexos2/R 0w40, or M1 15w50, etc.
I run the M1 ESPx3 0w-40 dexos2 because it has Porsche specs, which are higher than anything GM specs for the Camaro/Corvette and its cheapest with the autozone deal.

Can you summarize the main differences from Dexos2 to DexosR? Or, maybe specifically the mobil1 ESPX3 vs Supercar? I think i read somewhere, maybe BITOG, that they just used the same formulation in a different bottle since it already met the DexosR specs... probably incorrect but thought i'd ask.

[FollowMyLine]

Originally Posted by Capricio

Can you summarize the main differences from Dexos2 to DexosR? Or, maybe specifically the mobil1 ESPX3 vs Supercar? I think i read somewhere, maybe BITOG, that they just used the same formulation in a different bottle since it already met the DexosR specs... probably incorrect but thought i'd ask.

I covered it in another post in here. Different formulation, by which the HTHS, Kinematic Viscosity, Ash levels, Zinc Levels, Phosphor levels, etc. are all different.

[LT4Greg]

Good video and enjoyed watching it. I will keep using 5W30 Synthetic in my 2017 ZL1 though since I haven’t had any issues with using it. Thanks for the informative video!��

[CalgaryZL1]

Great video but I don’t daily drive my car so I will stick with my Amsoil signature 0-40, believe it or not it’s way easier to get it than trying to find supercar 0-40 or let alone the 5-50 in Alberta Canada

[FollowMyLine]

Originally Posted by CalgaryZL1

Great video but I don’t daily drive my car so I will stick with my Amsoil signature 0-40, believe it or not it’s way easier to get it than trying to find supercar 0-40 or let alone the 5-50 in Alberta Canada

Amsoil meets or exceeds DexosR, they just refuse to pay for the certification, so you’re good!

[CalgaryZL1]

Originally Posted by FollowMyLine

Amsoil meets or exceeds DexosR, they just refuse to pay for the certification, so you’re good!

You got that right!

[ZPirate]

Originally Posted by haggler

There is a oil spec called HTHS (high temp high shear) which dexos2 5w30 has a min value of 3.5. This value is inversely related to fuel efficiency. the 5w30 dex1g3 has a value of 3.0. Street cars are prescribed Dex1g3. The higher value will be better for performance engines driven hard.
GM never had a "performance" spec oil until they branded DexosR, before that they were just using Dexos2 which is for gas/diesel with low sulphur and ash (SAPS) with the previously mentioned higher min HTHS value. Basically dexos2 has a higher bar to meet than dexos1. Realisitically for street driving you could run any dexos1/2 5w30. For track any Dexos2/R 0w40, or M1 15w50, etc.
I run the M1 ESPx3 0w-40 dexos2 because it has Porsche specs, which are higher than anything GM specs for the Camaro/Corvette and its cheapest with the autozone deal.

I read the same thing about M1 ESPx3 and it being made to Porsche specs that are more stringent than GM specs.
Basically an enhanced version of ESP. That's why I've been using it, along with it being Dexos2. And of course the cost and availability. My guess is that GM wants to differentiate its oil from Porsche oil in order to pacify Corvette owners so it asked M1 to change ESP to Supercar so it's not confused with ESPX3. That's why Supercar was created, for Corvette owners primarily.

[XXX ZL1]

Originally Posted by FollowMyLine

Amsoil meets or exceeds DexosR, they just refuse to pay for the certification, so you’re good!

Same with the Driven oils. They just didn't pay for the cert. Seems for many it just isn't worth it.

[FollowMyLine]

Originally Posted by XXX ZL1

Same with the Driven oils. They just didn't pay for the cert. Seems for many it just isn't worth it.

Yes, and same with Redline. The point of my video wasn’t to compare oil brands, it was to help clear up some of the recommended oils from GM. Seems it may not have done that either. 😅

[CalgaryZL1]

Originally Posted by FollowMyLine

Yes, and same with Redline. The point of my video wasn’t to compare oil brands, it was to help clear up some of the recommended oils from GM. Seems it may not have done that either. 😅

You explained it perfect! Thanks.

[ember1205]

Originally Posted by CamaroRSOnt

My 2023 manual still says 5W-30 is ok to use if your not tracking the car, most folks aren't putting their SS on the track.


Here from the manual pg 238...my question would be why would Dexos2 5w-30 (which is widely available) not be ok for non-track vehicles?

I get the whole EPA thing but from a warranty point of view and what works for a street driven car, why are these difficult to find oils the focus? Most people here worry about their warranty more so than the EPA. GM has really muddied the waters on this.

Originally Posted by CamaroRSOnt

Thanks ! I kinda thought that GM meant to say Dexos2 in the manual given I couldn't find any DexosR 5w-30's anywhere. Amazing how complex putting oil in a Camaro can be

dexos is mostly a marketing thing. Yes, there are specific standards for the different "tiers", but GM is using the whole thing to generate revenue and little else. Each rating is set in advance to expire and sales under that rating are no longer allowed. This is why the dexos1 oils are now at "Gen 3". From what I can tell, the dexos2 stuff was simply moved to dexosR as a way to get the oil manufacturers to pony up more cash to have their oil certified again.

The new owner's manuals tell you that the 5W-30 oil is still totally fine (in the LT1) for street use, but they are claiming it has to be dexosR and there are no 5W-30 oils that are certified at that rating. Given that absolutely NO appreciable changes have been introduced into the LT1 motor since we first saw it in the 2016 model year, please explain to me how the more newly built ones require oil certified at a certain level that doesn't even exist? You can't, because they don't.

I will continue to run the Kirkland 5W-30 dexos1 oil (Warren Distributing) in my 2SS and not lose one second of sleep over it.

Given that GM can't be trusted to not do stupid things like release vehicles with 1LT and LT1 trim level names that are VERY different, use the LT1 moniker for a trim level AND an engine, and other super-confusing things to the general public, I'm not going to sweat something as dumb as them changing the names of their oil certification tiers to generate revenue for them...

[haggler]

Originally Posted by Capricio

Can you summarize the main differences from Dexos2 to DexosR? Or, maybe specifically the mobil1 ESPX3 vs Supercar? I think i read somewhere, maybe BITOG, that they just used the same formulation in a different bottle since it already met the DexosR specs... probably incorrect but thought i'd ask.

If you wanna get into the weeds these are minimum specs:

Dexos2
https://360.lubrizol.com/Specifications/GM/GM-dexos2

Dexos1 gen3 (this is for "regular" cars)
https://360.lubrizol.com/Specifications/GM/GM-dexos1

Note the limits are tighter for dexos2.

DexosR, only info on M1 site, but I'd bet its basically a copy of old ESP (dexos2). M1 reps also admitted to corvette blogger that its basically the same formulation as the old ESP just repackaged.

https://www.mobil.com/en/lubricants/...supercar-0w-40

"old" ESP formula, 0w-40 dexos2 specs: https://www.mobil.com/en-us/passenge...-formula-0w-40

"new" ESPx3 0w-40 with porsche approvals: https://www.mobil.com/en/lubricants/...1-esp-x3-0w-40

attached lubrizol comparison tool, also available here: https://online.lubrizol.com/relperftool/pc.html#

all that to say....if dexos1gen3 5w30 is good enough for warranty...any of the rest will do...

[GregH]

FollowMyLine - Great video! Thanks for the information!

In the video you mention running 5w-50 only if you drive 3 seasons (spring, summer, fall) and that if you drive winters, you would want to run the 0w-40 in the winter.

With that said, it is OK, however, to run 5w-30 (for street use) all year round.

Why is 5w-30 ok year round but 5w-50 wouldn't be?

I'm definitely not an oil expert, so I'm just trying to understand (and make sense of) all of these nuances with different oil weights & dexos certs, etc.