Over 170k miles here, last 70k has been on M[1] 0-40 LL spec EuroCar formula. Even with severe tow duty (hauled a few 7,500 lb trailer/boat combos) I have never seen blue smoke. At oil change time the level is still where it was at last fill.

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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!