Does anyone know if Chevy made any improvements at all to the 2013's?

Have a 427 Vert on order and mostly concerned with mechanical improvements.

Does the LS7 still have M1 oil for the factory fill? I know GM has that new Dexos oil which I understand is a Syn blend. Are they putting that in the LS7 too just to save money?

 

I don't think Dexos means it has to be a synthetic blend. Why do you suggest that? Is the min. requirement of Dexos1 is synthetic blend and that's why you're suggesting GM is using it? I'd think GM is still using Mobil-1 5w30 as factory fill which is full synthetic; I don't see why they'd change it for '13...

 

Nope. LS7's still blow early like they always have

 

From what I read they are using Dexos in everything now? To me it seems like a downgrade from full synthetic M1 to a syn blend. I could be wrong but I believe that Dexos is not even available in full synthetic.

I for one would want to use a full synthetic in my LS7 because of some of the issues I have read about on the forum regarding the LS7.

 

Define "blow early"? I've got almost 55,000 miles on my '09, and it's still running strong. It has not had any mechanical issue.

 

THe formulations are always changing, but the last I read, Mobil 1 5w30 is not a full synthetic. It's base stock contains highly refined petroleum which makes it a synthetic blend. As of around 2011, the only standard Mobile 1 oil wait to be a full synthetic base stock was 10w30. Otherwise to get the full synthetic base stock you need to step up to the Extended Performance oil line from Mobile.

With that being the case, it's likely that GM could have switched over to their own synthetic blend oil. Especially if they've spent the money to develop it.

That doesn't automatically make it superior, or inferior to what GM previously filled the crankcases with though. You'd have to compare oil analysis across the line of LSX engines with the Mobile 1 and their new formulation.

 

The owners manuel on my new one "2013 427" says to use the the Mobil 1 syn Dexos

 

Mobil 1 5W-30
Mobil 1 5W-30, an officially dexos1 licensed product, is an advanced full synthetic motor oil that helps extend engine life by reducing engine wear and oil breakdown. Mobil 1 5W-30 provides outstanding performance under all operating conditions and meets or exceeds the warranty requirements where an API certified oil is specified.

 

i would imagine this is a jab at the valve guides

 

You = Lucky. It's all just math

 

Thanks for the info.

How do you like your new Vert?

Any negatives?

I should have mine by the end of September.

 

You hit the nail on the head!

Exactly why I started this thread.

The valve guides are what I am worried about. The rockers too.

Wonder if GM made any valve train changes the last couple of years on the LS7?

 

It's good to note that there are also several "blend" oils on the market from manufacturers such as Penzoil and Valvoline that also meet dexos1 criteria.

Being dexos1 certified does not mean the oil is a pure base stock synthetic.

The truth is, nobody except the people creating the formulations at Mobil and other manufacturers truly knows what that formulation is. Mobil 1 tends to return UOA's with higher than normal iron content, which at the very least should make you raise an eye-brow to their claim of "full synthetic."

I'm not saying I dislike this oil, mearly that in teh case of this thread, I wouldn't worry about if they changed the oil or not. Mobil 1 5w30 is marketed in the US as a full synthetic, but there's no oversite of that. One of the reasons that GM now has dexos1 certification. WHich of course has nothing to do with what exactly the motor oil is, but more to do with quality standards of it. This lends itself to oils that are at least, in part, synthetic based, but does not specifically call for a true synthetic base stock.

The problem with highly refined petroleum is that it's mineral content can oxidize. As corvette owners we know that a lot of us let these cars sit for extended periods of time. In that time, an oil that contains petroleum content can begin to rush. As you can imagine, that's not so good for the engine itself. This is why you see 3month/3000 miles and so on. After a while that oil begins to break down.

So my point wasn't to stop using Mobil, but instead to not really worry about what the factory puts in there. What GM uses should give you enough peace of mind to make it at least as far as your warranty extends. But also to make sure people realize that at GM, Ford, Lexus, Nissan et. al the bean counters still have a say in every part of a vehicle, including the oil. You should choose your oil on the basis of how and where you use your vehicle.

In regards to the 7.0, I never had a single problem with my 2008. It was noisier than my LS2 and LS3 equipped cars, but no actual mechanic problems.

Remember that people don't usually post about successes, but they do post about failures. So it's easy to see several posts on a forum about blown up engines. What you don't see is the thousands of people running around with no problems at all.

 

And they still have a 100K warranty.

 

Yes they do...BUT....for the majority of this crowd, their engines will NEVER see that kind of milage.

 

In one place my 2013 Corvette 427 Convertible the manual says this;

Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is
recommended.

In another area it says these two paragraphs;

Use and ask for licensed engine oils with the dexos1® approved certification mark. Engine oils meeting the requirements for the vehicle should have the dexos1 approved certification mark. This certification mark indicates that the oil has been approved to the dexos1 specification. Corvette recommends Mobil 1® engine oils that meet the requirements of the dexos1 specification for its dry-sump equipped engines.

SAE 5W-30 is the best viscosity grade for the vehicle. Do not use
other viscosity grade oils such as SAE 10W-30, 10W-40, or 20W-50.

 

 

unless tuned....

 

As does the manual for my 2012 GS with LS3 dry sump.

 

My 2012 Grand Sport A6 has the same info in the manual. I was a little surprised to see "DEXOS" on the oil cap and not "MOBIL 1"

-Bob George