i think i have the answer to your question however my bentley manual is @ home and i am at work right now.
I read that there is a lever under the hood (forgot where) in which you flip the switch and it will reset the service interval.
for 99-00 328's and also 323's all you have to do is hold the trip odometer button down for in think 10 seconds I have been doing it for the past 2 yrs after oil changes. do a search for oil reset and you will find a detailed answer....
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