i believe ganito ang ginagawa ng iba. example if the owner's manual calls for Dexron III ATF, they will use a cheaper Dexron III ATF or equivalent for flushing, and then use premium Dexron III ATF for refilling. now in your case, you may use a Type T-IV equivalent ATF for flushing, and then use genuine Toyota Type T-IV ATF for refilling.





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