You have a few options at this point...

1) sell before the big ticket items hit (trans failure)
2) buy an extended warranty
3) take a chance and keep driving it

You can always list it for sale and see if you get a solid offer.

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver