So I called my local dealer today to ask a few questions and order a few parts for baselining the new LX470. I asked him what tranny fluid it took and he told me it was a Toyota Specific Type4 fluid. Told me to do a full flush I needed to buy a full case and I had to order the fluid from the dealer. I understand I need a lot of fluid to do a full flush but isn't "TYPE4 ATF" fluid available at any auto parts store? Any issue with going full synthetic?