X25

I would like to stick to a dexos1 approved oil for my 2013 Z06 to preserve my warranty and leave nothing to question, but would also like to use 5W-40 instead of a 5W-30 oil for better protection at high temp. What are the options? I did a quick search, and the only oil I found was Royal Purple 5W-40. I used this oil at my Subaru STi back when I used to own one, and remember it pouring out of my oil plug like water (was not thick at all), which worried me at the time.

Do any of you guys use this oil (Royal Purple 5W-40)? Did you ever get it tested? Any other dexos1-approved alternatives?

JCtx

Define 'better protection'. If you're not going to constantly track your car, 5/40 is NOT going to protect your engine better. You'd be just adding unnecessary friction, and reduce lubrication. If you're going to push the engine hard often, and switch back to 5/30 in winter, then, and only then, I'd switch to 5/40. By the way, if you want to stick with Mobil1, you can always buy 0/40; even better for the engine when cold. And it should be Dexos1 approved. Good luck.

X25

I see 270 degrees when the car is pushed, and know that Mobil1 5W-30 is not good at those temps. Mobil1 0w-40 would actually be perfect, but is it really dexos1 approved? I will reserach..

JCtx

If you push it that much, then it makes sense. And the good thing about Mobil1 0-40 is that it's actually a better oil than the regular Mobil1, since it's truly fully synthetic (Group IV sold in Europe, vs Group III). Whether it's Dexos1 or not I wouldn't honestly care, since using 40 grade oil is not recommended either . Good luck.

All2Easy

Mobil 1 0W40 is not Dexos 1.

Gearhead Jim

IIRC, the Owner Manual specifically tells us to use 5W-30. So anything else, even if Dexos1 approved, does not meet the specs for warranty.
Not likely that GM would raise a stink about it, unless you had a problem they believed was related to lubrication. But ya never know for sure...

gotjuice?

Mobil 1 is Dexos approved. It is a little better than Dexos. There are a lot of oil that are better than both of those.

gbrtng

Looking around in Wally World the other day and the only DEXOS1 oil I saw was 5W-30 - and that was across several brands - leads me to believe 5W-30 is the only viscosity GM is approving for the DEXOS1 specification.

HOXXOH

It is the GM recommended oil for Corvettes in Europe. Chevy doesn't build the engines any different for foreign consumption.

From the Mobil website:

Mobil 1™ 5W-30 is an advanced full synthetic motor oil designed to keep your engine running like new by providing exceptional wear protection, cleaning power and overall performance. It meets the demanding ILSAC GF-5 performance standards, and is dexos1™ approved by General Motors.

Mobil 1™ 0W-40 is an advanced full synthetic motor oil designed to help provide exceptional cleaning power, wear protection and overall performance. Mobil 1 0W-40 keeps your engine running like new in all driving conditions.

Mobil 1 ESP 0W-40 has the General Motors Service Fill dexos2TM approval, which is required for all 2010 new GM/Opel/Vauxhall/Chevrolet Diesel and Gasoline models. GM/Opel have advised that dexos2TM specification is backward compatible to older GM/Opel specifications (GM-LL-A-025 and GM-LL-B-025). The majority of GM/Opel/Vauxhall/Chevrolet Diesel and Gasoline vehicles can use dexos2TM lubricants.

HOXXOH

Here's the list of Mobil 1 labels with viscosities that meet the dexos1 spec from the dexos website. There are many other brands that fit the spec, but there is no application guide.

Mobil 1 0W-20
0W-20

Mobil 1 0W-30
0W-30

Mobil 1 5W-20
5W-20

Mobil 1 5W-30
5W-30

Mobil 1 x 1 5W-30
5W-30

Mobil 1 Extended Performance 5W-20
5W-20

Mobil 1 Extended Performance 5W-30
5W-30

Mobil Super 3000 Formula D1
5W-30

Mobil Super Synthetic 5W-30
5W-30

Also in the list is AC Delco oil that's supplied by GM.

ACDelco dexos1® SAE 5W-30
ACDelco dexos1® SAE 5W-20
ACDelco dexos1® SAE 0W-20

And even these:


GM Genuine Motor Oil dexos1™ 5W-20
Supplied by General Motors Korea
For sale in Korea Only

and

GM Genuine Oil dexos1™ 5W-30
Supplied by General Motors Thailand
For sale globally

Confused yet?

X25

If I understand correctly, Royal Purple 5w-40 is one of the oils listed as dexos1 approved:
http://royalpurpleconsumer.com/produ...rple-motor-oil

Anyhow, after a bit of research, it looks like Mobil1 0w-40 would be a much better fit for the job. It provides outstanding protection BOTH cold and hot, appears to be the factory fill for Z06s sold in Europe, and many forum members here recommend it until temps as high as 280+s. The 5w-30 Mobil1 oil seams to break down at 265 degrees at oil tests (even though it kept its protection intact during the tests at that temp), which means if you ever reach that temp any time, you need to change your oil ASAP. No, thanks.

All2Easy

Mobil 1 0W40 is a good choice....however, for those that don't track their cars, the 5w30 is adequate and will meet warranty requirements since it is DEXOS 1 while the 0W40 is not.

Since my car is cammed, I went a different route. I prefer an oil with a higher level of ZDDP than even the 0W40 can provide.

TMyers

I have never seen north of 250 in anything remotely called street driving. I have seen 290 during an HPDE. Per the owners manual I swap oil right after said events. While you will have higher viscosity with 0W-40 when at higher temps the break down points for both are not that far apart. IMO it is a matter of cooling and not a matter of which oil to use.


But the way I read the RP site the oils are not dexos1 and ILSAC GF-5 licensed but meet the API-Licensed requirements. That is not to say that RP isbad, they have not gone through the proper testing. Here is the list of current Dexos1 approved oils.

http://www.gmdexos.com/licensedbrand...sedbrands.html