Major problems!!!

[ktay05]

So....I am a new BMW x5 owner I bought the x5 a month ago from a family friend....and well let's just say it been bad luck since....about a week ago my car didn't start, so naturally I thought it was either the battery or alternator, after checking both I was lost, so I took it to BMW to get the diagnostic test, and after a day I got the worst news.....major leaking!!! There are two coolant leaks, both washer fluid leaks, power steering leak, oil leaks in two places, mass air flow sensor not working, sensor from steering wheel to wheels faulty, front right cv boot problem....add it all up jus to fix it to make it safe and operable to drive is between $6000-6700 !!!!!! I got the 2001 BMW x5 for $11,000 and I got a warranty....needless to say the warranty won't cover jack!!! I've been fighting with them for the past week and they said they will get back to me and see if they will cover some stuff.....I contacted the previous owner and he has had it periodically checked and there was no problems.......!!! So maybe it was bad luck or a very big mistake....let me know what you guys think or if you have any ideas on what to do.....the dealership is giving me the price they would give the warranty co. Which is cheaper..so they say, they offered me a trade in value of $4500-5000!!!!! Should I take it and lose $6000 or get it fixed and sell it later for a lower loss?

Please any help would be nice.....I wish I still had my scion tc!!!!
Much easier and cheaper to fix!!!! However I loved the x5 while I had it.......I would love to keep it!!! At least till the scion frs or a newer BMW....when I can afford one!