I am getting a used 2007 Jeep Wrangler Unlimited X next week and was wondering if anybody could please give me some insight on how to identify what type of transfer case and diffs I may have. Also, I spoke to Royal Purple and they said that using any other fluids besides what Jeep sells would void my warranty. I have never heard of this but I could see car manufacturer doing this to boost their maintenance sales. I do not know what this jeep has been through so I am going to change all fluids; both diffs, oil, transfer, tranny, etc. Any information will be appreciated.