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
1 answer 1 comment
ANSWER by on 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 on September 20, 2011
THANK YOU. IT'S MUCH LIKE I THOUGHT IT WOULD BE. MALCOLM