That's a garbage answer. He doesn't know what was put in there, so is going vague.No. This is my trusted mechanic. He said he used ATF for "import" that is equivalent to DW1.
The wrong ATF. While sometimes there are coincidences, the odds of "coincidence" and your tranny was about to fail no matter what are extremely low, in my estimation.That's why I don't know what could cause this.
Are you going to continue using this trusted mechanic? Has he offered to make it right?
Personally, I would hold the mechanic to a much higher standard than some retail stock clerk who made a substitution. Remember, the WM clerk told you it was a substitute and gave you the opportunity to accept or decline it. Totally appropriate conduct. The mechanic poured whatever into your tranny, without asking, and has just played dumb. Which, on second thought, may not be an act.