I switched out the OE fluid to Mobil [1] 75-90 Syn (GL-5) at 100k miles. At over 150k now with ks of miles towing a 6k lb trailer, even towed my brothers 7500 lb boat/trailer from north PA to Toms River NJ last month. No issues.
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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!
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