I love it when people make uneducated statements like "when the transmissions blow up in a few years cause billy bob used the darn DEX 111 coo coo ca choo, that'll show dem dumb city boys". MANY EX toyota T-IV users have logged thousands of trouble free miles with synthetic products that are suitable in DEX III apps. If you want to keep using the toyota stuff cool, but enough with the ignorant statements that are untrue and build on the paranoia complex that ensure toyota and mobil's share holders/execs eat steak and lobster every night.