I have a 2009 Altima that is approaching 150,000 miles. I looked back in the records and the dealership changed the transmission fluid 5 years ago at 97,000 miles for the first time for $200. I am trying to determine if that should be changed again now but doing a search online I have found everything from reading that it should be changed every 30,000 and that only the dealer can do it to reading that it never needs to be changed. So here I am asking you guys. Should this been changed again now and can I have an independent shop do it or does it need to be done by the dealer? I only ask because I have read where you can only use the Nissan CVT fluid.