TEECEE

Just curious to when everyone first changed the diff oil from new and how often after that??? Thanks!!

WhiteZ07

TEECEE

Interesting. Thank you.

Higgs Boson

changed my diff and manual trans fluids at 500 and will never change them again.

Clspht

Yup. . Once and done .. (different story if your tracking it)

Bill Dearborn

No need to change them unless tracking the car. If tracking the car change after first event and after each 24 hours of subsequent track usage. Track usage dumps a hell of a lot more heat into the diff than street/highway driving. Your OM is correct when it doesn't show a service interval for the diff in the maintenance requirements. If you don't change the fluid the diff will last well past 100K miles just like millions of other modern diffs that are on the road today If you change the fluid you will get about the same lifetime.

Bill

pkincy

Many of us changed early as there was a spate of folks that found out they had only partial fills in the diff and very loose fill bolts. I never measured my fill but clearly got out less than the 2.75 quarts that my measured fill in gave me. And yes my fill bolt was only finger tight.

TEECEE

Great info here guys!

Z0HS1CK

I didn't change mine at 500 miles but i have 13k now.

I will change it in spring and that's going to be it. Because i don't think i'll have the car for more than 2 years from now anyway.

capevettes

I agree. I changed mine at about 2,000 miles. My logic was, with all the reported underfilled rear diffs, I might as well check it. Since I was checking it, it was just too easy to change it, so I did. Alot easier to change than the C6 Z I had before it.
My 2016 was full and the plugs were tight. I have no plans to do it again.

Rdubfalco

Changed Diff at 5k miles and was expecting break-in material. Was clean as w whistle, glad I did it though. Now I will do the M7 trans sometime. At 8k miles currently.

6104696

I had the dealer (Criswell) check the diff fluid when I had the car in for the 500 mile oil change (2016). They reported it as slightly low and supposedly topped it off, no charge. I have no plans to change it or worry about it for the foreseeable future. 13K miles now.

GoatHead

I changed mine at around 2k and after my first DE event. I am planning on changing it every year, if I track the car.

Z0HS1CK

Is it worth to do the manual trans fluid though? I heard even from factory it's good for 75-100k.

now I'm thinking if I should do it while I'm having the diff fluid done too.

capevettes

Rob, if you aren't tracking it and you aren't having anything more going on than the typical, cold 2nd gear nibbles, I wouldn't bother.

Thomasmoto

My rear diff was replaced under warranty at approx. 30K miles. After that I had all new diff, gears, axles and oil upgraded a while back. I'm at 64K now and will prolly change it again in 20K to 30K from now unless I find out differently.

Dnmscz

Changed mine at 2K, very dirty and measured at least 16oz low. Easy job and cheap to change.

TEECEE

Thank you all. I have 6400 miles, no tracking. I think Ill do it come Spring. Cant hurt!

Vegas1500

fleming23