You could pressure wash your whole driveway. It does an excellent job, & wouldn't have lighter patches from spot cleaning.
To remove oil from concrete driveways:
http://answers.yahoo.com/question/index?qid=1006011901037
To remove oil from blacktop driveways:
http://answers.yahoo.com/question/index?qid=20080830072603AAGWQZH
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