: when do i chng diff fluid??

01-25-06, 11:30 AM
oil monitor recs oil change -7k since last oil chng and 14k on 04 v. recs on diff change intervals and what fluid??? time is precious so maybe synthetic fluid would extend intervals. btw, im on orig diff for now. thanxxx

50 4Ever
01-25-06, 12:17 PM
SAE 75W-90 Synthetic. As to when to change, every 50,000 miles. Check level once in a while, like before a track event or once a year at least.

01-25-06, 12:18 PM
Supposedly some dealers have told V owners that changing their rear diff fluid with "non-GM" approved fluids will void the warranty.

I would check with your service manager to verify this; a nice synthetic would be great, but at what expense? (I am actually curious about this question too...)

01-25-06, 01:31 PM
I have changed the diff fluid every 7 or 8 thousand miles. There was a lot of metal on the plug. I look at it as cheap insurance and my dealer knows I care.So if I need another diff, it goes in without any grief!!! :thumbsup:

01-25-06, 02:11 PM
good thought, cause im sure ill need a new diff b4 warranty expires.