I've been using either Amsoil or Mobil one synthetic ATF for the past 125,000 miles..ever since I bought the car....no problems...I replace fluid and filter every year, (approx. 25-30K miles a year).

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)