I know there is a lot of knowledge hear and a lot of utube stuff...but no one hear is going to back my warranty when I say at the dealer....joe smoe said I could do this....
So my question is .....is there an official number that I can call, besides dealer, where I can get a official answer from gm.....?? The Concierge gives some but not official..
Thanks

 

I am not aware of a number where you can get an official ruling about a modification in advance. One thing is this - forum members have reported on modifications they did that resulted in denial of a warranty claim. So if you say what you want to do, someone who has done that may report that it was a problem. For example, there was a discussion of a lowering kit. The person had a subsequent issue with the front lift. The dealer would not work on the issue until the owner returned the car to stock height. I think in that case it may have eventually worked out. But the Service Manual includes many many procedures that start with "check for aftermarket equipment". And the result can lead to denial of a warranty claim. Generally, a modification is not supposed to cause denial of a warranty claim unless the modification actually caused the problem. In practice, a dealer can claim (and they do) that a modification did cause a problem, and it becomes the customers problem to prove otherwise. Anyway, while you cant get an answer from the forum that a mod is ok, you can get an answer that certain mods did cause a problem. And that is a valid data point.

 

What, regarding any and all potential customer mods? GM, nor any other manufacturer, is going to "approve" ANY mod they do not directly approve, supervise, or monitor the installation of. The best/safest mod can almost always be screwed-up by some slipshod installer. The best you are likely to do is monitor/search online for things of specific interest and see what others have experienced regarding post-install warranty claims. Typically, the mod has to be directly involved with the claim to be relevant, but GM can do as they wish... for the most part. Now, enjoy the car!

 

Various people from GM, including Corvette team members, have stated that they're not going to recommend, approve, or even comment on any part that doesn't have a GM part number. The only 100% certain statement regarding mods is that if you mod your car, you are accepting the risk that if it causes a failure of something else, GM might not warranty the failed part. And that even if the failure wasn't actually caused by the mod, GM might say that it was the cause and deny warranty coverage. And, of course, if the aftermarket part fails GM isn't going to cover it. Even if a dealer tells you the mod won't affect your warranty, remember that GM approves warranty repairs, not the dealer.

Mod at your own risk. Use the experiences of others as a guide to measuring the level of risk.

 

I think you've gotten a lot of very good advice above. Altho you "may" be able to corral a high-up engineer, plant exec, or someone else at a meeting such as the Corvette Museum Bash, as stated above, they may not comment on other company's products. Seems a bit odd, but that's the way it is.

I think this Forum has a ton of people with both practical and real experience: you wonder about the effect of a product on your car re warranty? Ask here. You will get a ton of opinions, most of which are spot on. But, always remember that IF someone says, hey! you'll be A-OK if you do that and something breaks! You will still pay the bill if it is not covered---they won't. Now you know the truth is, it's always on you and your wallet. You gamble? You are gambling. With your money, and your car.

There is one other forum dedicated to the C8 but you'd have to go there and ask the same questions. May as well start here if you want some response. Be specific, and tell what you know about the product. Good luck.

 

sanman55, let me just put this whole thing to rest. You just posted a question regarding a GM 'phone number' you could call to get tacit approval from the manufacturer to carry out modifications in which they would assure you that your warranty would be unaffected. Here is the best advice you'll get: enjoy your Corvette as-is and leave it the hell alone. You have neither the requisite experience, critical thinking skills or coping mechanisms necessary to even go down this road. I'm not trying to be derisive, it is simply a long life of studying human behavior that leads me to this conclusion.

 

Good advice. As they say, mod your car at your own risk.

 

I would even hazard a guess that if you had an OEM high wing installed on a serial number car that did not have the high wing on the original PO, and you had and issue with the wing, the first question would be, "Who installed it?". I'd expect the installing dealer to back the wing, but maybe nobody else. That's easy, straightforward work. Extend that to the more complex systems, and I think the only support you would get is from a dealer that did the work. If you, or a non-chevy entity did any mods from original PO, expect pushback.

 

If your C8 doesn't perform the way you want, perhaps you need to consider another car.... for most of us it's the Corvette we've been wanting from the beginning.... the evolution is amazing.

 

Sorry I was not clear .but I am talking about service and maintance items NOT mods ....Like the book says one thing and latter on the book says another..and then here people say another.
I want more clairty from the people that made this beauty.
..I guess I should have cked. back sooner to correct the course this thread went. SORRY about that..

 

Best to post specific example/s.

 

Wow. Have you even met this guy? I have and your post is way off base. I spent my career correcting human behavior. I’ll spare the forum my thoughts about you after reading your post.

 

It is true that the statements about maintenance are scattered through out the Owners Manual, in all model years. I have sorted through the entire manual for all maintenance related statements. I have not found any inconsistencies - please point them out if you have found something. I summarized what appears in the 2021 and 2023 manuals in a table, and I highlighted any differences between the prior model year and the 2023 manual. It is attached below. I am not suggesting that you do what my table says - rather - I have indicated the pages where the statement are found. You can go and read the statements yourself and decide what you want to do. There is one area that is controversial. The manuals (all of them) appear to say that when a transmission fluid change is indicated you must also change the external canister filter. There is no doubt the statement is there. It even appears in the 2023 manual even though a separate fluid filter life monitor was added. Some have suggested it must be a typo or a cut and paste error.

 

How you doing on dealing with Personality Disorders? Say, a good Borderline.

 

You have a point with an item like a flush before a DCT filter change. Although not in the owner's manual there is documentation that says it should be performed. The C8 Tech that did mine showed me what it stated in the GM Service Computer.

However there is at least one series of posts (and the fellow sent me a PM as well) where the car was purchased and DCT filter being replaced by MacMulkin a very large Corvette dealer. He was told several times that they do not perform a flush unless there is a transmission CEL etc. There is no GM documentation that says that is accurate. From the number of forum posts where a DCT CEL was found early and with the dealer told to perform a flush the error was eliminated sure sounds prudent.

BUT the dealer will put in the GM Computer for your cars service record, that the DCT filter was replaced. It probably says nothing about the flush as it doesn't about cleaning the cover bolt threads with a tape that is also in the procedure. The dealer probably was reimbursed for the whole procedure as normal. In that case an authorized service dealer entered the info in the GM computer and you're covered.

Could be similar with the dealer NOT using the correct specified 0W-40 oil. How would GM know! Dealer gets reimbursed for the procedure (although my zero cost receipt showed the proper ESP oil and a quart of the GM DCT fluid used to replace the ~8 oz in the housing.

There are a number of posts where a dealer tech or service writer gave the wrong advise! Good solution is if you have a question ask on the Forum. However like all Internet "recommendations" (for legal reasons I only make suggestions ) you will have to determine which answers are correct!

 

Ask your chevy shop services your car what mods they are ok with and what they are not, it varies dealer to dealer, some dealerships install mods other want nothing to do with them

 

I had a similar desire to get the answer from the horses mouth on conflicting service information or information missing from the owners manual. If you call GM customer service they will just refer you to the dealer for the information. An example is accessing the rear fuse block under the center speaker panel. The step on how to remove the center speaker panel is missing from the owner's manual. The procedure starts out with the panel removed.

Another example is the first DCT filter change mileage interval is 7500 miles but they don't state how much deviation you are allowed from that. Nobody (well, maybe someone will) is going to have it changed at exactly 7500 miles. In my case I had the DCT filter changed at 4600 miles even though some believe that is too early and it should be done again. However, I have backup documentation in an email form the Corvette Concierge and a screenshot from a Chevrolet chat session, as well as a discussion with my dealer, saying that is OK and I'm good for another 22,500 miles.

Unfortunately, that is the best you can do unless GM issues a TSB or something.

 

I was usually one of the last people those kind saw before they were escorted out the door.

 

Thanks...that was one question I had If I ask that hear I get so many different answers..Look at what I have stired up already
I have said this before ...I am following the manual on maintance page....was that not the reason they put the dct filter life on the 2023

mod

 

Thanks Dawg.......