Bob...
Where did you get a "Mobil 1, 5w-30" cap? I don't have a Z06...but I've always used Mobil 1 in all my cars....

Thanks in advance..
Wes

 

BobsZO6, I had the same problem trying to get a 500 mile Mobil One oil change and I insisted Mobile 1 and the dealer I bought the Z51 from sent me a check for the change. Actually my situation was a little different because about two weeks after I bought the Z51 I went to a local high volume Corvette dealer to get the oil change and they told me that the car was still in the dealers name and they could not honor the oil change. Needless to say it was a mess for sure, but between Chevrolet and the selling dealer they got it straightened out. That is what the service writer based his comment on no Mobil 1. He said My cap read Dexos and he said thats all he could put in it. ?? Anyhow, thats why I want to get a Mobil 1 cap. Where can I get a mobil one cap for my Z51 ??

 

Check to make sure as there are two caps . . . this should fir the dry sump engines.

ACDelco FC215; on Amazon for almost nuttin'

 

There's a whole bunch of you guys talking past each other.

dexos is an oil specification, not an oil!

This entire issue is what we C7 owners should be receiving in our included oil changes as part of what we paid for in our purchases based on the GM corporate service directives.

The label on the C7 oil cap shows "dexos 5w-30". This is the OIL SPECIFICATION AND VISCOSITY REQUIRED FOR WARRANTY COMPLIANCE. It does NOT tell you what BRAND to use. Both the GM semi-syn and Mobil1 synthetic 5w-30 meet these requirements - as well as do MANY MANY OTHER OILS.

All the clamor about getting Mobil1 in our C7s is because "we're supposed to get it" and it's arguably a superior oil to the GM semi-syn dexos 5w-30 oil. IMO, the standard GM 5w-30 semi-sym dexos rated oil is MORE than sufficient for 99% of the C7 drivers. The small benefits of a full synthetic would seldom be seen in use by most of us.

"dexos" is an oil certification, not an oil type. GM created this spec after it introduced its direct injected (DI) engines. Oil producers must certify to it and pay royalties to become a licensee to label their oil as such. This is very similar to the API and ILSAC certifications you see on the back of the bottles with the exception of royalties.

Many oils meet the dexos certification - BOTH semi-synthetic AND synthetic. Specifically dexos1 is what GM requires for its for gasoline engines.

This same info above has been posted countless times. This is the current list of fully licensed dexos brands/viscosities:

http://www.centerforqa.com/gm/dexos1-brands

Again, dexos is NOT an oil. It's a specification. C7 owners need to simply select ANY dexos certified 5w-30 oil to comply with the "letter of the law" for warranty.

Get Mobil1 with your free changes at the dealer. After that, consider doing a bit of independent research and make educated decisions based on data and YOUR use.

All that said, I do my own oil changes (skip the free ones) to avoid the dealer debacles, and I use Penzoil Ultra over Mobil1 based on my research.

 

I have repeatedly said I don't much care what brand oil is in my C7
as long as it's FULL synthetic. We've used many many different brands.
The bottom line is:
GM/Chevrolet recommends/reimburses dealerships for Mobil 1 synthetic.

Bottom line.
(Yes, wasn't specific enough to say Dexos was a specification of oil, not a brand)

 

Amazon/AC Delco . . . there are two types . . . screw on and quarter turn. Be sure to get the right one $10-15, easy speasy ACDelco FC215

 

thank you .. ordered it from amazon.
charlie

 

I just cut to size the Mobil 1 stickers I got from Exxon/Mobil last year and stuck on the cap, deleting the word dexos.

 

Is this the correct cap for a non-Z51 car, i.e. without the dry sump? Thanks.

 

I have yet to find a Mobil 1 cap for the wet sump engines.

Just talk to the service manager BEFORE you schedule an oil change appointment. If he/she doesn't confirm they'll use Mobil 1, contact Chevy Customer Care and ask them to contact your dealer BEFORE you schedule the appointment. Don't wait until after the dealer has already used the "incorrect" oil.

 

When I put in FC215 IT says will not fit 2015 corvette. Also which one fits dry sump. screw on or quarter turn?

 

Whole thread about it here...quarter turn for dry sumps.

https://www.corvetteforum.com/forums...iller-cap.html

$15 at Amazon with free Prime shipping if you're a member. Info at Amazon is not up to date on fitment, and technically it's the wrong one since ours say dexos.

 

This fits my Z06.....

GM Performance 12593356 CAP ASM-OIL FIL (MOBIL 1- 5W30)
SKU: GMP-12593356

Part number: 12593356

Manufacturer: GM Performance

 

I just put my first 500 miles on my Z51 and have scheduled its first Mobil 1 oil change at the dealer. I requested that he put 15W-50 Mobil 1 in rather than the 5W-30 Mobil 1. My reasoning for the 15W-50 is that in the summer, oil warm-up is not as critical as it is in the winter months. I will also be doing occasional track days with the car. The O/M calls for replacing the 5W-30 Mobil 1 oil with 15W-50 Mobil 1 oil for track day use. It seems ridiculous to have to make the switch during the summer just for a track day. The dealer service manager has told me that they will not be reimbursed for replacing the break-in oil with 15W-50 Mobil 1 oil. He also mentioned something about voiding the warranty which I also think is bunk! If all of this is true, it probably has more to do with maintaining their CAFE rating with the C7 than it does with any related engine lubrication issues. Does anybody have any official word from GM/Chevrolet that refutes what this dealer believes? Thanks.

Bill

 

Opinions aside, for non-track use, the C7 requires a dexos1 approved 5w-30 oil. Mobil1 15w-50 is required for track use (short-term), and is NOT dexos approved. While the response from the dealer may sound dramatic, he's technically right, and therefore justified in GM not paying for it vs. the warranty-compliant Mobil1 5w-30. Just the facts.

Fuel economy may be one reason, but the additive package is not designed the same as dexos (GM) requirements. I have read on more than one reputable source that the enhanced anti-wear additives helpful for racing used in Mobil1 15w-50 (ZDDP) are not intended for long-term use with modern catalytic converters. I'm sure there may be other reasons the 15w-50 additive package may not do well for extended use (based on the OLM).

dexos1 approved oils here: http://www.centerforqa.com/gm/dexos1-brands

Please read the CF thread here on 15w-50 too:

https://www.corvetteforum.com/forums...certified.html

 

Talked me into it! It always helps to have reason than just "NO"! Thanks not only for the answer but quick and educated response.

Bill

 

You are correct. Mobil 1 15W50 has a high level of ZDDP. and this is why I used it in my Euro M635 (no cats). It is a great oil for certain applications but is not considered a good choice for a street car with a modern engine and catalytic converters. Its use in a C7 should be for track use only and then replaced with a dexos oil for everyday driving.

After review of the list of dexos certified oils, it is clear that there are numerous options out there that meet the GM requirements for the C7. The use of Mobil 1 probably has a lot more to do with an agreement between GM and Exxon/Mobil. Personally, I am not going to get my panties in a wad or get into a big discussion with my dealer as long as they use a dexos approved oil and it is installed correctly and in the correct quantity. Don't get me wrong Mobil 1 is a fine oil but there are a lot of quality oils. Also, most Corvette owners change their oil on a more frequent basis and thus the use of a full synthetic that has a useful life of up to 15K miles is more than sufficient. According to GM a synthetic blend is a perfectly acceptable alternative as long as it is dexos certified.

 

 

If you want to get a cap for near nothing or as much as $15 go for it but just because the cap says it doesn't guarantee the dealer will put Mobil One in. The key is getting your dealer on board with what the car requires. I just had my Z 51 in last week for it's first service and said to make sure they use Mobil One. The service manager called a bit later and said they're be an upcharge for Mobil One which I authorized. I promptly printed off info from this thread to have in hand when I went to pick the car up. At that time the manager said there'd be no charge as he looked further in to it and it calls for Mobil One. He did say there was conflicting direction in service manuals on what oil to use so there was some confusion. And while I have used Mobil One in most my vehicles including a 2006 Vette and 2012 Camaro for many years I agree that the key is the use of full synthetic. We Corvette owners just have a comfort level in Mobil One because it was the first synthetic oil the "General" put in cars from the factory. But I'm pretty sure there are quite a few other quality full synthetics on the market today.

 

Got my first oil change today at 694 miles, Mobil 1 at Schumacher Chevy in Littles Falls NJ. I asked for: 1) Vette certified tech and 2) to observe at a distance they were comfortable with. Both requests were honored. Dave the tech took me to where my baby was and proceeded to explain to me much more about my vette that the oil change. He was great and the dealership was great about the experiance. I would recommend dealership.