Some Dollar-saving car question!!!

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1. My father alway told me to let the car warm up for at lest 3 minute before moving it and to rev the engine briefly before turning it off. Good advise? 2. The oil on the dipstick my gas station attendant showed me was dark. He told me its time to change the oil, but my car has only traveled 3000mile since the last one. What wrong? 3. How often should you have your car front end aligned? I hope myLotter can help me to solve my problem. (^_^)