I cannot reply to an oil thread due to my religion... However, http://www.bimmerforums.com/
is a good BMW forum where you might find an answer. I used it recently to get info to fix a friends brakes on her 5 series.

As far as the molecule count, I would suggest asking him just how many molecules are in there. The last time I heard a story like that was at the mattress store.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra