My X ran to 100k miles on BMW service changes at the SII interval, after 100k I switched to M[1] 0-40 EuroCar formula (LL Spec) changed when the 3rd green LED of the SII goes out. At over 170k now without issues (still running OE timing chain guides).

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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!