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He didn’t flush it then, he just washed the inside of the case. To do a proper flush, you need to remove the oil cooler pipes and hook them up to a flushing machine with the transmission running. The purpose of a flush, when you change the oil you’re only changing half the oil. A lot of it stays inside the torque converter, pump, valves etc. so if you put in new oil it’s automatically contaminated as soon as you start the engine and it mixes with the remaining old oil. When you flush with a flushing machine, it pumps fresh oil through everything and cleans it properly. Dexol in Al Quoz are the best auto transmission specialists I’ve worked with in UAE. Maybe worth speaking to them.