There is a discussion of extended maintenance plans on the E85 Board; . If Iíve read the thread correctly, you can buy 50K miles beyond the basic warranty for $900 - $1,600, depending on the dealer. Iím planning on keeping the Z4 for a long time, so this is worth my looking into. Two, questions: Is my understanding correct, and which dealer offers the best price?2.5 TiAg/Black/Black/Premium/Convenience/5-Speed/Zenon/Fog