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I'm sure that you are correct but the cap (GM 12680708) that I purchased was the one recommended by Harlan Charles, who is the Corvette Product Marketing Manager.

Unfortunately, the cap was supposed to be delivered today but the USPS says that it cannot be delivered due to an incomplete address. I will not name the supplier at this time as I will give them another (and final) chance on Monday to correct the error and send me a new cap while the original one is being returned to them via the selfsame USPS system.
 

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Thanks for the heads up CATOYZ and welcome to our forum.
 

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Wrong Oil

Available at Costco.com $38.69/6pack. Get an extra $10.00 off special price through 4/28
Free shipping!
Sorry to tell you this, but the Mobil 1 0W40 motor oil on the Costco website is NOT the Mobil 1 0W40 formulated for your Corvette. It is the European blend designed for use in European brands only. The Mobil 1 0W40 designed for the Corvette is ESP 0W40 and has Dexos on the label. I have attached a photo of the label on a quart for reference. DO NOT use the European blend in your Corvette. It is not Dexos 2 certified and doesn’t have the same temperature rating as the ESP 0W40.

624A89BA-CBB8-4674-BFB8-D0892000AEE3.jpeg
 

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ACDelco FC265 is the oil cap that has the Mobil1 0w-40 dexos branding on it. The “dexos” is not visible in the photo of the product on the web due to the angle the picture is taken, but it IS on the cap. Currently priced at $10
 

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0W-40 Mobil 1 - Oil Cap Part Numbers

The official GM part numbers for the new oil caps are:
• 12686472 – 2019 Corvette Stingray w/o Z51
• 12680708 – 2019 Corvette Stingray w/Z51, Grand Sport, Z06, ZR1
We checked around online and the new oil cap part numbers are starting to show up in various Chevrolet/GM official parts websites. We found them starting at the low price of $6.45 at ChevroletOnlineParts (The Stingray Z51/Grand Sport/Z06/ZR1 oil cap is priced at $23.12). These prices DO NOT INCLUDE SHIPPING. When I checked for mine, $6.45 + $11.00 shipping. I saved $8.33 by getting it at the local dealer a mile from my office.

JoeCT you would need the 12680708 cap. My Vette is a non Z51 and I picked up the cap at my local dealer for $9.12 out the door. They had to order it and it came in the next day.
 

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Just a reminder to those of you planning on replacing your filler caps: the caps are NOT interchangeable between a base wet sump and the dry sump Z51, GS, Z06 and ZR1. As CruznCorvette noted in his post #28, they are different part numbers.
 

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Here in the Phoenix are, I've found exactly one source for the Mobil 1 OW-40, that's Freeway Chevrolet. No other dealer or auto parts store has it, even the ones who are self-proclaimed Corvette specialists. I used it for the last change on my '15 Z51 and for the 500 mile oil change on the '19 Camaro. I'll get some more as soon as the Z06 arrives as well; maybe lay in some inventory at home. I'm wondering if this thin supply line will improve anytime, and what if the C8 spec is for something different?
 
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