Went to Jiffy Lube over the weekend for a regular oil change and they were trying to convince me that I needed to change the Rear Differential oil because it looked dirty. I declined to do it, but just want to make sure it's not really needed.

I only have 30K miles on my 2007 Expy. Has anyone had to do it so early?

P.S: They also wanted to flush my Power Steering fluid for $99.00.....