I should have mentioned I have towed a 6000lb trailer for over 10k miles on the Castrol fluid (seen 120deg F on OBC outside temp in stop and go construction traffic, AC on max, over a dozen times in TX). Even towed a +7500lb sport boat/trailer combo twice between PA and NJ shore, picked up dropped off in the PA mountains.

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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!