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Hi, my manual says to use ACDELCO dexos 1 synthetic blend and for track or competitive driving use Mobil 1. My information packet included a booklet from Mobil 1 saying that Mobil 1 synthetic has been used since 1992 for factory fill and service fill,so which one should I use?
 

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Under the GM Customer Care program, all Corvettes should get Mobil 1 for the two free oil changes provided in the first two years (4 changes for 2014 and 2015 cars). GM reimburses dealers for Mobil 1, and that's what they should use.

For a little more detail, Dexos is an oil specification, not an actual oil brand or type. You should always us an oil that is certified by GM to meet the Dexos spec in order to maintain warranty coverage. Mobil 1, and many other quality oils, meet the Dexos specification.
 

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peli, I've always used Mobile 1 synthetic for our C7 masterpiece and our 70 Camaro it's an excellent product. It's your choice which brand you use. Mobile 1 is back in partnership with the General providing the oil for all C7's off the assembly line.

SF
Rick
 

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Peli - if you have the ability, consider changing the oil yourself. There are TOO MANY stories of dealers overfilling Z51s with oil, or using the wrong oil (installing Dexos syn blend instead of Mobil 1 - Mobil 1 is what all dealerships should be using during the 2 year free service interval).

I do my own changes, and I've been using Pennzoil Ultra Platinum (my preferred full synthetic) since my 1st 500 mile change. Your C7's high HP motor deserves only a full synthetic oil, not a Dexos blend.


 

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Discussion Starter #5
Thanks, I have 200 miles before my oil change. I am going to speak to the service manager before I bring my car in. I will be using Mobil synthetic. Thanks again for all your help.
 

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if I had access to a lift I would do it. Having said that I got my changed yesterday at a dealer I trust. They do it on the alignment rack this eliminates the scissor jack and lowers risk that pucks might not be used. The alignment tech did it and he did my other two Z-51s. The oil used was Mobil 1 and the job was free. I left very happy. One thing the odo read 800 miles as I bought it in Texas and did not want it changed during the trip home. Charlie aka cutnout
 

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My 17 Grand Sport is serviced at Auto Nation 8600 Pines Boulevard. When I first got my car, I drove over there and spoke to the service manager. I told them my concerns and that I had dry sump and that I wanted someone who knew what they were doing. He set me up with Shivanand ( just call him Shiv) he is my one and only service advisor. Luis is the mechanic and the only one who touches my car. Luis is fantastic. These two are my dedicated team and the only ones who deal with me and my car. Great guys. If you go, tell them that Gloria with the white Grand Sport recommended them.
 

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peli,

I am really glad you have found a team that you trust to service your Corvette. Gives one great peace of mind. Your going there are talking with the Service Manager up front was a very smart idea. Thanks for sharing the particulars here.
 

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Every dealer that sells corvettes has to have corvette technicians working in service. These are guys that only work on corvettes ect.
 

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And FYI the dexos blend you are referring to is actually a full synthetic now. There is no more dexos blend at gm dealers.
 

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Every dealer that sells corvettes has to have corvette technicians working in service. These are guys that only work on corvettes ect.
And FYI the dexos blend you are referring to is actually a full synthetic now. There is no more dexos blend at gm dealers.
Hmm, first, agree the dealer must have a C7 Trained Tech to sell Vettes. But they may also have all oil changes done at the oil change bay where a newbie "mechanics helper" may work! That C7 Tech makes more money fixing a truck diesel than changing oil!

Second, dealers are independent business folks. 99.5% of all cars they service just need to use GM dexos spec oil. I just checked the website and searched for dexos approved brands and there were over 50 blends in the hundreds of those GM has approved (and get paid a tribute for doing so! Names like Quaker State, Pennzoil, Sunoco, Valvoline were listed has having blends approved as well as full synthetics.) By the way, API also gets a small fee per quart for an oil manufacturer saying an oil meets their spec. Almost all oils list those specs as I believe it is less expensive that the GM "tribute!" API (America Petroleum Institute) and SAE (Society of Automotive Engineers) specs are usually listed on all oil. The dealer can buy whatever oil in 55 gallon drums he wishes that meets the dexos spec. They do NOT have to buy AC/Delco oil (which is from whoever was the cheapest in that buying period who labeled the oil from GM! They are not in the oil business.)

That "mechanics helper" has two choices on his own, pump from that 55 gallon drum of Oh-So-Peachy dexos approved brand blend (that the service manager may have purchased because it was cheaper) in his work station OR going to the parts department and checking out 10 quarts of Mobil 1 and luging those back to the service bay!

Since 99.5% of the cars and trucks he services are wet sumps, he may not want to take the time to underfill then check the level before topping up, which takes time for a dry sump! That assumes they know there are two drain plugs and that you can't check the oil, which must be hot, after 10 minutes or you'll get a false low reading as some drains back to the pan! That is why free oil changes are not worth the potential risk for some of us and we change our own as I did for my 2014 Z51 and am doing for my Grand Sport! It's not as crazy as it may soud! Mobil has a rebate twice per year, there is one now on their website. I'll pay ~$25/jug for two 5 quart jugs of 5-30 Mobil 1 at Walmart with "meets dexos" printed on the jug. I'll get two $12 rebates (two are allowed) so I'm paying $2.60 per quart and I'll have about 1 left over! Quicker for me to jack up the car, change the oil, know it's done right than going to the dealer.

But I'm only 75 so maybe when I get "old" I'll use the dealer! :smug:
Just Sayn'!
 

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Maybe my dealer is different, but all corvettes can only be serviced by corvette techs including regular maintenance. I know this because my good friend is one of the three corvette techs at this dealer.
 

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Maybe my dealer is different, but all corvettes can only be serviced by corvette techs including regular maintenance. I know this because my good friend is one of the three corvette techs at this dealer.
That may be dealership policy. At my dealer, there is a seasoned lube tech, that's all he does, he's not a Corvette certified tech. First time there with mine in '14 with the '14, I observed his procedure, followed the book, very thorough and professional, was quite satisfied, definitely tip certified in my book.
 

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That may be dealership policy. At my dealer, there is a seasoned lube tech, that's all he does, he's not a Corvette certified tech. First time there with mine in '14 with the '14, I observed his procedure, followed the book, very thorough and professional, was quite satisfied, definitely tip certified in my book.
He is the only tech in the shop that gets to go home "oily" every day. :smilet-digitalpoint
 

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A different service technique is employed at my dealership. Only the Corvette Master Tech Ken changes the oil and filter on my Corvette. When I learned about their great service program, our then owning a new 2006 Z, I offered to pay more for my Tech to do even basic oil/filter changes. I was told, “no extra charge for Ken to do all the work on your Corvette. Just ask for him when you call to make all your appointments.”
 

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I did take advantage of two free oil changes but both times it took a little more discussion than was necessary to convince the service writer that Mobil 1 would be used in my wet sump engine at no additional cost. Many of you remember that GM initially said Mobil 1 would be free for only dry sump motors. They amended that policy to include all C7's but not all dealers got the message.

Anyway, although there is a great Corvette tech at my local dealership, I found out he doesn't routinely do oil changes. So I now do my own with a set of Race Ramps from Reverse Logic, a SRF vendor. The less people that touch, drive, park or walk past my Stingray, the better I like it. :suspicion:
 

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Every dealer that sells corvettes has to have corvette technicians working in service. These are guys that only work on corvettes ect.
Mikeyt03,
I have taken my 16 Z06 Vert to my local dealer and was informed they have excellent mechanics with all types of certification and none are Corvette Specialists. I had the oil change at 500 for the break in and it was changed by a young man that does oil changes but, a lot of his friends all work on corvettes. I had a stroke when i found out he was the guy that did the oil change. I am searching for a dealer with a Corvette Specislist to work on any repairs or service needed. The late Sid Harchelroad told me at the Ron Fellowes School only a Corvette certified mechanic needed to do all work to the car. I am disappointed that my dealer does not have a Specialist as many Corvettes as they sell. I was considering ordering a ZR1 (provided they can get the trade difference acceptable) but, i don't want to drive 50 or more miles to have a Corvette mechanic work on my car and not get a loaner to go home and return when the car is done. Just thought i would throw that out to let everyone know.
 

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I did take advantage of two free oil changes but both times it took a little more discussion than was necessary to convince the service writer that Mobil 1 would be used in my wet sump engine at no additional cost.
Mikeyt03,
I have taken my 16 Z06 Vert to my local dealer and was informed they have excellent mechanics with all types of certification and none are Corvette Specialists. I had the oil change at 500 for the break in and it was changed by a young man that does oil changes but, a lot of his friends all work on corvettes. I had a stroke when i found out he was the guy that did the oil change.
Don't need to be a trained C7 Certified Tech to change oil properly. I'm proof! I think the key is as Henry427 states; Talk to the Service Writer and preferably the person who will do the change and understand what they will do! If I were having the dealer change oil in my Dry Sump, I would be sure it was with Mobil 1 oil and tell them to add only 9 quarts, give me the 10th and then check when I got the car home and add as needed. that is what I do when I do it myself and am adding less than a half quart to bring it to half way between MIN (which says add one quart0 and MAX. Then your oil is hot, it will be a bit darker than when it was added, making it a bit easier to see on the dip stick!

Like many skilled trades hard to get good mechanics. That C7 Tech is usually one of the best at the dealership as the dealer invested money and time to have them trained. Most mechanics work on commission based on doing a specific job faster than the GM time estimate. They can make much more working on a diesel truck than changing Vette oil! For most this is their job not their hobby!

PS: Recall a post where they were told by the service manager we cannot just put in 9 quarts and give you the 10th quart! IMO that is an excuse because they will pump from the Oh-So-Peachy dexos approved brand of an oil blend in the 55 gallon drum in the oil change bay!
 
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