I have a 2011 Acura Mdx with SH-AWD 85k and I have had it for almost 2 years. I had the transmission flushed the day after i bought it. Did another flush mid summer this year. Looked on my car fax and called the dealership and the rear diff has yet to be flushed. I am wondering any suggestions on product that i could use to refill? Also it does have a place to drain gear oil right behind the transmission any suggestions on gear oil and how often I would need to change. I do not tow anything mainly its used by my wife 5-7 miles a week if that but I do occ drive it a week out of each month 50 miles round trip for me in traffic.