See pages 98-99 in your Owner's Manual. The middle colum on page 99 gives directions on resetting the Flexible Service System counter. In case you have a different manual, look it up in the index under "flexible service system".:p

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300SD ('81), 190E ('89), 420SEL ('86?), Jaguar XJ6 VDP ('96), E320 ('95), Jaguar XJ6 ('97), E320 [S210] 4matic wagon ('98), Nissan Maxima SE ('02), DeVille ('93), BMW 325 ('03), LS430 Ultra ('01), Avalon Limited ('05), S430 ('06), MINI Cooper ('05), Toyota Camry ('07), Hyundai Azera Limited ('07), E350 ('06), LS430 ('05)
Current rides:
Nissan Versa ('08), S430 ('03)