Wrong differential oil
Thread Starter
3rd Gear
Joined: Feb 2023
Posts: 3
Likes: 1
Wrong differential oil
Guys
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
Popular Reply
Feb 9, 2023, 02:32 PM
Burning Brakes
Joined: Jun 2019
Posts: 1,212
Likes: 939
From: Georgetown, Tx
Get it filled with the correct fluid, put some miles on it and bring it up to operating temperature, and then change it again. You should be ok.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
ttt
Guys
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
Burning Brakes
Joined: Mar 2022
Posts: 1,220
Likes: 733
From: Phoenix, Arizona
And by putting miles on it, I'd think no more than 20 miles at operating temperature would be necessary before you change it back out again.
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Race Director
Joined: Apr 2000
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From: Texas
Sounds like that fluid doesn't have the limited slip additive in it and you're hearing the clutch packs. Have them change it. It may take some figure 8s in the parking lot and a few miles for the new fluid to get rid of the pops and noises.
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I agree with having them change the oil with the right stuff this time. If there is any damage, they should pay to have it fixed.
Pro
Joined: Nov 2013
Posts: 693
Likes: 158
From: Milwaukee WI
I would call the service center and ask them if they want to pay for towing for them to correct the error, or have you drive it in. That will show them you are serious about them correcting their error and any damage caused by driving any further is on them.
Drifting
Joined: Dec 2019
Posts: 1,811
Likes: 615
From: Blacksburg Va
Just drive it to them and get it changed. Then you need to drive it for a while before changing it again. It is also possible that you won't need a second change. Think about a typical clutch pack lim slip diff. To simplify a little you have a stack of discs, maybe 12 of them. Every other disc is connected to the left axle. The ones in between are connected to the right axle. These discs are pushed tightly together so they will slip in relation to each other only under certain conditions. What you are hearing is the discs trying to slip but they have the wrong fluid to make that slip a smooth process. The reason I say drive it for a while is it will take some time for the old fluid to work out from between the discs and the new fluid to work in. BTW, like kaplana I use Mobil 1 LS 75-90 in mine. But in your situation I would go w/ whatever GM recommends.
Race Director
Joined: Sep 2007
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
In the future, if you need someone else to do maintenance on your car, purchase the parts and/or fluids yourself and simply pay them for the labor. Finding a place that'll let you watch or assist is a bonus, to be assured that it's done correctly and with your supplied products. Creating a relationship with an independent shop and financially compensating them well, will pay off in the long run.
Pro
Joined: Nov 2015
Posts: 582
Likes: 170
From: Indiana
Guys
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
I need help!!
I went to a poor service center where they changed my differential oil with ACdelco 75W90 GL5 which I came to discover it’s not the GM recommended part number for my 2016 C7 corvette when I drive slow speed and I turn full right or left I hear a weird sound in the rear.
IT s it too late for my differential or I can replace it with the recommended fluid and the noise will go away ?
Instructor
Joined: Mar 2019
Posts: 186
Likes: 118
From: Kansas
Regards, Jeff