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Discussion Starter · #21 ·
FYI, I called around to the top three Corvette Sales Dealerships and asked the question to the service technical or the appointment scheduler and they all answered yes. So you might want to do the same so that when you are ready you would know where to go. Good Luck!

Wow, that is quite the deal Jeremy! Since several members including you have had such success, I might try that next time RedHot needs an oil change.
 

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Discussion Starter · #22 · (Edited)
I was trying to create a voting survey but couldn't figure it out on the site but maybe only admins can do polls or surveys or voting type posts? Anyhow, this thread might be appropriate to piggyback off since it's about the oil you are purchasing.

I was in COSTCO yesterday and what jumped out at me on end cap was their Kirkland Signature 5w30 Full Synthetic Oil. The Costco Kirkland brand in many items are very good and they are pretty meticulous with their branded products and I just wonder is this actually Mobil1 5w30 just re-branded to capture an additional market of customers?

Keep in mind, this is along the lines of Brand vs Generic in Prescription Drugs. Many of the generic drug companies are now owned by the Big Brand companies that in simple terms change the color and shape of the exact same pill and those that want the brand pays the branded higher price and those that want savings take a chance on the generic at cheaper price not doing unbeknownst to them they are really the same drug. The drug company is a win-win because they are getting revenue regardless of which you purchase.

So, this brings me to the question of would you use the Costco branded "Kirkland Signature 5w30 Full Synthetic Oil" that cost $27 for 5-Quart 2-Pack in your C7.....Why/Why Not?

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Interesting question. Here is a pretty extensive review of that Costco oil:

 
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OK, back to your question kgrant: "would you use the Costco branded "Kirkland Signature 5w30 Full Synthetic Oil" that cost $27 for 5-Quart 2-Pack in your C7.....Why/Why Not?" If I changed the oil myself in RedHot, I might consider it, especially based on the review I posted in #23 above. However, I really like my dealer, have a great relationship with their top Corvette Service Manager and continue to have them do the oil and filter changes on RedHot. Since I use my GM Loyalty Rewards, the cost of the change is minimal each time. :cool:
 
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Mobil 1 5W-30 and the warranty correct GM-Delco filter. I take my 2015 C7 to my local independent mechanic who works on anything but is known for Corvettes. He supplies the oil and filter and total cost is $79.99. I hang out in his waiting room and I'm out of there in 30 minutes or less.
 

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Thanks and which filter are you using?

I wonder why they say "high mileage" in the heading but that is not on the container.... Website typo by Walmart perhaps? I checked other sites and they don't have the "high mileage" so just typo on Walmart's site.

Wow, you can't beat Walmart's 3x 5 quarts for $58 so if I am not mistaken, I can get six 5-quarts for $116 and enough for 3 oil changes because I believe it takes 9 quarts and FREE 2-day delivery..

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I'm kind of new here but enjoying your thread. My dealer has a "quick change" oil change service. Rarely had to wait. One of the guys changing a few changes ago, that I could bring my own oil and pay, I think it was 35 bucks. Still a better deal than the normal way. Like a dummy, I keep forgetting to get the oil before I go!
Thanks again for your question and to al that answered. BTW, with the Z51 pkg, I believe it takes 10 quarts.
 

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Welcome to our forum C7=heaven.
 

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Mobil 1™ – Corvette’s recommended motor oil

Mobil 1™ advanced full synthetic motor oil has served as the factory fill for many Chevrolet Corvettes, including the 2020 Chevrolet Corvette Stingray, and the recommended service fill for all Corvettes since 1993. As the Corvette evolved into the current world-class C7 sports car, the formulation of Mobil 1 motor oil advanced to meet the demands of these modern high-performance engines.

Mobil 1™ 5W-30 is the recommended service fill for many generations of Corvette, but for all C7 Corvettes we recommend upgrading to Mobil 1™ ESP Formula 0W-40. Please download our PDF for more information.
Today, Mobil 1™ ESP Formula 0W-40 synthetic motor oil is the factory fill for all C7 Corvette models and can be used by most C7 Corvette owners on both the street and the track (2019 ZR1 owners are asked to use Mobil 1™ 15W-50 for track days).

Mobil 1 motor oils are designed at the molecular level and enhanced with a proprietary additive system to provide outstanding protection against wear, heat, cold weather and sludge buildup – helping to keep Corvette engines running like new.

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Another interesting post, thanks. A long and for me, a bit confusing tho. Which oil did you chose for your change? The 5W-30 or the 0W-40?
 

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I am perfectly happy to use what the owner's manual recommends for my car, can't go wrong, takes the guessing game out.
 

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Discussion Starter · #31 · (Edited)
I use Mobil 1™ 5W-30 which I believe most do and what the manufacturer recommend. The point of the thread was Costco sells Kirkland Signature 5w30 Full Synthetic under their Kirkland label at a nice savings over the Mobil1 5w30. So it really was about if the Costco brand was comparable and would you use in your C7. The studies seems to suggest that it's just as good at 40% less. Not sure where 0w40 came into play but I posted info below on 0w40 vs 5w30 for your reference.


Here’s a google search information:

THE 0W40 AND THE 5W30

The motor oils in study are both fuel economical because they maintain a good level of thin oil viscosity, But the 5W30 maintains a better level in both hot and cold temperature and it is also generally recommended for being economical in fuel consumption.

0W-40 is much better for the summer. Mobil1 SuperSyn 0W-40 is some pretty good stuff overall. You can certainly use 5W-30, but I wouldn't, particularly if your engine has seen only 40 weight oil its whole life, or if you live in a very hot climate. ... This means that the oil will not thin out as much with use.

Another interesting post, thanks. A long and for me, a bit confusing tho. Which oil did you chose for your change? The 5W-30 or the 0W-40?
 

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Discussion Starter · #32 ·
I just stumbled across and article that spoke to the Top 20 Costco Kirkland Branded items produced by major labels ranging from foil, coffee and automotive oil. Many Kirkland Products Actually Big Brands In Disguise!

I just clipped the section on automotive oil below:

#13:
Kirkland Signature Full Synthetic SAE 5W-30: Warren Motor Oil

Costco is good for more than just groceries because they also carry tires and other car necessities. You can even purchase motor oil at Costco. Warren Oil makes Kirkland Signature Full Synthetic SAE 5w-30; it clearly states their name on the back of the jug, so there’s no mystery there.


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Warren also manufactures Amazon Basics motor oil, so you know that you’re buying a top-notch product for a lot less money. With a price point of $24.39 for five quarts, you shouldn’t pass up this impressive bargain. This one more example of a big brand standing behind the Kirkland label.

Warren also manufactures Amazon Basics motor oil, so you know that you’re buying a top-notch product for a lot less money. With a price point of $24.39 for five quarts, you shouldn’t pass up this impressive bargain. This one more example of a big brand standing behind the Kirkland label.
 
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