Spoiler Light On

Hi. My Wife And I Have A 2001 New Beetle That We Bought New And I Have Several Questions I Hope Someone Can Answer. First Off The Color Is Vortex Blue. Does Anyone Have Any Idea How Many This Color Were Produced? Next The Spoiler Light Randomly Comes On And Stays On. No Pattern. Also Randomly When She Pulls Out The Key A Beeper Will Go Off For A Second. I Have Had It Checked For Codes None Present. Lastly The Last Time We Had The Oil Changed, Has Only Been Done By The Dealer, It Cost Us $60. They Said That Volkswagen Required It For The Turbo Motor. I Find It Funny That They Wait Until The Car Went Out Of The 2 Year Maintnence Warranty To Decide This. The Car Has 18000 Miles Now. For What Its Worth We Bought The Car On Friday The 13th Of April 2001. Bad Omen? Maybe. Thanks Mike.