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There are all kinds of rhetoric on the Internet about what kind of oil to use in the T5 transmission, from ATF to gear oil to everything in between. With that said, there’s also some confusion between what to run in the World Class and non-WC transmissions. My transmission is of the non-WC variety, so I opted to go with Royal Purple Synchromax manual transmission fluid as it’s formulated specifically for this application. At the time of press, I’ve got a few hundred miles on the truck at this point and it seems to be working great.