Dealer says my Infinity M35X should have the rear differential purged? on 2008 Infiniti M35

I have never heard of this before in 52 years of owning automobiles including Cadillacs, etc? The car has 48,000 miles.

by in Stephens City, VA on September 19, 2011
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
ANSWER by , September 19, 2011
According to the Alldata information there is not a manufacture recommended interval for the rear differential. Most likely the vehicle came factory filled with synthetic gear lube and is considered lifetime. we recommend gear lube drain/replenish on time and mileage 60k would be a interval that I would be thinking about changing gear lubes. Dan @ Waterloo Motors Inc.
COMMENT by , September 20, 2011
THANK YOU. IT'S MUCH LIKE I THOUGHT IT WOULD BE. MALCOLM