I apologize in advance for the long post.
Last July I had the engine tick service bulletin performed on my 2023 Z06 when the car had approximately 750 miles on it. Mine was the first Z06 the local dealer had seen so I was nervous having them do the work but they assured me they had a certified Corvette tech, so I had them proceed. As part of that service they changed the oil.
Everything seemed to go fine and the ticking noise was reduced. I was satisfied and proceeded to drive the car another 1700 miles or so up until last week when I read that some guys had had their oil changed and the dealer overfilled it because the tech hadn’t drained it properly before refilling. So I realized I should check my oil. You guessed it, it was way over the full mark. I checked it three different times to make sure, following the correct procedure of heating up the engine and checking with the motor running. Definitely overfilled, or at least that’s what the dipstick indicated.
So I took my car back to the dealer and explained what I think might have happened. I was a little upset but didn’t make a big deal out of it. They say no problem they’ll take care of it.
When I picked up the car the service mgr tells me the oil was NOT overfilled. Now I’m upset! I’m no mechanic but I am a 68 year old car guy and know how to check the oil in my Z. My mistake was not checking it with them when I dropped the car off but I didn’t think that was necessary. Obviously the service mgr and I had a somewhat spirited conversation but he insisted it wasn’t overfilled, and that’s what his documentation in the system states.
I’m not sure what kind of issues the overfill might cause, if any, but it should be documented in the car’s history that the oil WAS in fact overfilled. Am I making a big deal out of nothing? Should I contact GM?

 

Without documentation on either side, nothing will be resolved on this sadly. I assume when they said it wasn't overfilled that you rechecked and all was well after the visit (meaning they drained the excess oil while you were waiting)? Longshot but cameras should be watching the repair area so possible their cameras will show the car on a lift with the oil being drained. Not sure how you would obtain this footage or if it would show this so you're back to my first sentence.

Overfill can cause issues with the oil getting excessively "frothed" by the rotating assembly diminishing its ability to lubricate however given the cars oiling system, not sure if that fully holds water. If way way overfilled, it could get into the combustion chamber and lead towards detonation, fouling of plugs etc. If you've had no issues with the engine since the oil change, hopefully you were just a bit over and nothing egregious.

 

When you took it back did you take the time to pull the dipstick with the service writer and show it was over filled?

Frothing by the rotating assembly? No. The LT6 is a dry sump.

the overfill doubtful would cause and engine issues.

 

[QUOTE=Vega$Vette;1607909183]When you took it back did you take the time to pull the dipstick with the service writer and show it was over filled?

I didn’t. I stated in my original post that it was my mistake not doing that. Thought it wasn’t necessary. I was wrong.

 

Why do you think they came to a different conclusion than you? Two professionals specifically look at the issue and disagree, why is that you think?

 

My guess is the tech drained some oil, then the service manager came out and told the customer all is well, move along.

The same as when the shop foreman at my BMW dealership told me the tech didn't slice the inside of my tire when removing it & didn't completely mangle the tpms (after the tech told me he clamped the tpms with pliers trying to remove it). But that "professional" came to the conclusion that his tech didn't ruin my tire or tpms & I should pay $500 for a new tire & $200 for a new tpms plus $175 installation charge

"Professional" is probably the last label I'd give to most dealership service managers.

OP - I'd be looking for another dealer or perform basic maintenance yourself moving forward.

 

this, unfortunately.
Deny the problem ever happened and the service records say it never happened.

 

Yep. Not sure what I was thinking this AM when I responded. Dry sump can foam oil but not from overfilling.

 

[QUOTE=JABCAT;1607909843]My guess is the tech drained some oil, then the service manager came out and told the customer all is well, move along.

This exactly. They weren’t gonna admit they were the ones that overfilled it in the first place. Deny, deny, deny. There’s no doubt in my mind it was overfilled. Unless the dipstick is faulty. And I’m 100% sure that’s not the case. It reads fine now.

 

All of these Z06's are ticking not sure what is being to fix them???????

 

[QUOTE=Number 9;1607910241]What's the dipstick reading now?

 

[QUOTE=Michael A;1607911760]Dipstick is showing the proper level now. Just below the top dimple that indicates full.

 

My Z06 doesnt tick, and i have over 8000 miles..

 

What’s it reading now. ?

 

These are horrible stories. If GM can build a car like this, they can "properly" care for them. But they don't. They are too big to manage these vehicles in the same service deptartment with all the other trash they build. I worked as a line tech for GM, Chrysler, & Nissan. I won't take my car anywhere that I can't directly converse with the guy doing the work. Service writers are brainless monkeys who only know how to dumb down the bad news to the masses of equally brainless people who bring their cars to them.

I've had my free oil change. I've had my free trans service. I'm done.

 

Soooo, you restated a 6+ month old thread to vent about GM service? I’ll give you the benefit of the doubt and assume you’ve got an ax to grind due to a bad experience, but your overgeneralization doesn’t cover all Chevy dealers.

I am lucky enough to have half a dozen Chevy dealers within a 15 minute radius from my home. My dealer is awesome and I have trusted them with my Corvettes for going on 15 years now and I know the advisor and Corvette tech on a first name basis. I’m not saying bad Chevy service centers don’t exist, I know first hand they do, but don’t throw the baby out with the bath water.

Do your homework, ask around and find a dealer that are up to your standards.

 

When I had the dealer do the first oil change I had them put in 7 quarts and give me the 8th quart back and I would top it off with all up to normal temps. Their service invoice noted that. Whne I checked it, I was down a quart, put more than half in and then checked again and it did end up taking the full top-off quart. Obviously my dealer had done the proper drain, but I had specifically told them about the two drain plugs (mine was the first C8Z they had done) and I had ordered all the materials from them including the plastic drain plug. They actually ordered/ delivered the pan plug, but they di have the plastic 1/4 turn plug in stock which I now have. I went to the dealership 3 weeks before that change to make sure they know the C8Z was "different" from all the Stingrays they had done.

It is a shame that we have to take these types of precautions, but better than having it done wrong (doesn't mean that they won't mess up, but at lest they are forwarned that the customer will be checking the quality of the work). It helps when you provide them with the GM documentation. If you have a problem with the car it is also good to check if there are any Technical information letters (TILs) from GM on your specific problem. If there is, take a printed copy of that with you and give it to the service writer.

 

I didn't "restate" anything. I just responded to a thread that was suggested to me via email. And I'm not venting, just stating opinions. You have yours and I have mine. I'm not forcing mine on you, so don't try and force yours on me. You can just respectfully disagree.

You may find a dealership you trust but you're only kidding yourself. The turnover of mechanics within GM dealerships is always high. Not saying that good mechanics don't stay in one place but you never know who is going to work on your car. If you do have that kind of report with your dealership you're lucky. But most won't tell you who is going to work on your car. That is the nature of a service writer. And not all of them will only allow certain mechanics to work on vettes. Just read these nighmare stories here.

I've been around this industry for 40+ years. I have done my homework. The bottom line is, don't trust anyone. If you can do the work yourself that is your best option. If not, find someone with the knowledge, experience, facilities, and integrity to do it for you.

 

So much to unpack in one response. You “restarted” a 6 month old thread about someone having their oil overfilled and instead of answering the OP’s question you shared your salty perspective about Chevy service and validated your opinion as fact by listing your industry résumé. So please stop with the “I'm not venting, just stating opinions.” No point walking it back.

You clearly have an ax to grind with Chevy, and I’m sure you have your reasons, but if anyone is forcing an opinion on others it’s you. You claimed all Chevy dealers are bad and I replied by saying you are over generalizing and explained my relationship and experience with my dealer. YOU replied by saying, “you're only kidding yourself” and doubled down and said “don't trust anyone.”

I know my situation is closer to the exception than the rule, but don’t tell me what it is and isn’t when you don’t have a clue about my dealer. I do what I can on my Corvettes, but gratefully my dealer does have a Corvette tech and that’s all he works on. He and my service advisor have been there longer than I’ve been going there (15+ years) and they have always gone the extra mile getting things done right.

So, I’m curious, why did someone email you this thread?

 

Dear Mr. Keyboard Warrior,

I don't know who shat in your wheaties but you're not worth the time to argue with. You're obviously here simply for the sake of argument. Good Day to you sir.