earlier i asked if it was ok to use oreillys global atf in my dodge A-518 auto and many ppl said no use +4, i just talked to a transmission guru who has been rebuilding transmissions for over 35 years plus he is an old friend of the family, my uncle gave me his number, i called and asked him whats the best possible fluid to run in my transmission and he said hands down amsoil or royal purple and he said ether one will not fail you, but he said make sure you put at least 1000 miles on your rebuild before running ether royal purple or amsoil, he said regardless of who rebuilt it or what you have heard you run a transmission to around a thousand miles and completely flush all the fluid out, and then whatever fluid you decide to go with use that fluid for the rest of the transmissions life and service it every 25 thousand mileseven if your running high dollar amsoil or royal purple service it at 25 thousand miles cause at 25 thousand miles you need a new filter. he said the reason its important to not run a full synthetic atf untill at least a thousand miles is cause you want everything to set up in the transmission before going to a full syn, but after a thousand miles you can throw amsoil or royal purple and stick with the fluid you choose thru out the transmissions life servicing it every 25 thousand miles regardless of fluid. And he was not saying this as if it applys to every automatic transmission he was giving me his expert opinion how to get the most life out of my dodge A-518 automatic, he said +4 fluid works good to but it does not flow as good as the amsoil or the royal purple and he said over 95 percent of the dodge A-518 and A-500 trannys that came in his door was due to overheating the tranny and cooking just like with every other tranny heat is the number one enemy but he said more so in the A-518 and A-500s he said especially if it has a lock up converter, he said the main reason they fail cause of heat is from ppl not using there overdrive correctly, towing while in overdrive, climbing steep grades and lugging up hills in overdrive, not shutting the overdrive off while driving around in town, all that brings heat and cooks these trannys he said, Anyways i trust his word 110 percent he built an auto for my uncles 79 ford short bed a c6 transmission that lasted him 240 thousand miles, and all my uncle did was follow his instructions on how to care for the tranny and serviced it every 25 thousand miles. i never considered the amsoil or the royal purple atf because i figured everyone would say no use +4 because chrysler has not ok'd it to be used in +4 applications, but after this guy told me amsoil atf and royal purple atf max would be my safest bet as far as the best fluid to use to keep my transmission running as cool as possible i am going to use one of them, just wanted a little more feed back on which product you guys think is better? the royal purple is easier to obtain buts its more expensive, the amsoil has to be bought online and by the time i pay shipping and handling i will have most likely paid the same price that i could have spent on royal purple, my senses tell me that if one is better then the other id have to give the edge to the amsoil just because it seems to have been around longer and i have heard more great stuff bout amsoil then i have royal purple but id use ether one after what our family friend transmission guru told me. i guess it will come down to wich one is easier to obtain and which one i get the best for. unless any of you have good information showing one is better then the other.