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I am looking for the best place to get my transmission system flushed on my 2002 IS300 and I was wondering how Lexus performs their transmission flushes. Do they use a machine to flush the system and do they add in the chemical additives to help clean the transmission? I don't want to go to a place that puts in the extra chemical additives, since transmission fluid already has it's own detergent. Anybody know how Lexus performs the tranny flush? Any help is appreciated. Thank you! 