Has someone dogged this car?
Thread Starter
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
Has someone dogged this car?
I had my 2016's transmission oil and differential fluid changed by a shop. They said the transmission fluid looked good. The rear end fluid was black they said. The car only has 11,000 miles on it. Does this indicate that someone drove this car hard? Or is there a problem back there? I'm the 3rd owner.
Craig
Craig
Thread Starter
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
Originally Posted by spoolin98
That's normal, probably never changed after break in. GM doesn't require it to be changed but if you research it the gear oil is filthy from break in. Mine was black after 1500 miles.
Thanks for the quick response.
Burning Brakes
Joined: Feb 2018
Posts: 906
Likes: 196
From: Northeast, PA
No problem. You should be good to go for many miles now that you got all the break in material out. I did mine at 1500 miles and it was filthy, full of metal particles and really dark. Looked nothing like the fluid I put back in.
I plan on doing it again around 5000 miles and then that's it for awhile, unless I track the car at some point. Is yours manual or auto?
I plan on doing it again around 5000 miles and then that's it for awhile, unless I track the car at some point. Is yours manual or auto?
Thread Starter
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
It's an automatic.
I'm not too happy with the way it shifts either. I'm taking it to my tuner in January to change the shift points.
I put a device into the service port. It keeps the car in eight cylinder mode at all times. That helped some but it should be better.
I'm not too happy with the way it shifts either. I'm taking it to my tuner in January to change the shift points.
I put a device into the service port. It keeps the car in eight cylinder mode at all times. That helped some but it should be better.
Tech Contributor
Joined: Oct 1999
Posts: 41,062
Likes: 9,825
From: Charlotte, NC (formerly Endicott, NY)
I wouldn't worry about it. The diff lubricant gets dark pretty fast. For normal street operation GM says to change it at 45K miles I believe. 95% of owners will follow what the OM says or not change it at all. Most diffs will survive lack of maintenance until they have over 120K miles.
Bill
Bill
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