BMW 3-Series Oil Questions

Here is what Blackstone said about my most recent run of Rotella T6 in my 2004 X3:

Universal averages for BMW's M54 I-6 are based on about 6,400 miles on the oil. You ran this oil 8,352 miles, and wear read at or below average across the board. That's the best indication we know of that an engine is in good mechanical shape internally.

The TBN was 1.7(below 1.0 is low). However, by 10,000 miles the TBN drops to 0.5-0.8. Consequently, I believe that 15,000-18,000 miles is not a safe interval for my X3 based on my UOAs. Also note that I have run LL-01 oils(M1 0W-40) as well as HDEO synthetic oils(M1 5W-40, Rotella T6 5W-40) in the X3 and they have all performed in a similar fashion.That said, 6,000 is a bit excessive; I run M1 5-30 in my Mazdaspeed 3 for 7,500 miles and I know that the turbo motor is harder on oil than the NA M54.

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