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BMW 740i Questions

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It works for a while then stops working until we restart car.. Then it shuts off again after awhile ..
The BMW I'm looking at has 45,000 miles on it versus the S550 having 43,000 miles on it. I currently own an EClass.
when u turn the key to start the car sounds like it wants to turn over but jist cant
I am having a problem with the power steering it is foaming and coming out the resolver not sure if was supposed to put power steering fluid or ATF or brake fluid
engine light came on soon lost compression no power to gas peddle won't stay cranked just started this yesterday never had problem before drove to church fine coming home on freeway started losing conpression .
What should I particularly look for in order to determine if it has been properly looked after and what are the critical areas? Thanks
I was disconnecting and reconnecting my battery every night and then in the morning to be assured the car would start. All of a sudden the car doesn't even want to turn over. Have I damaged the electrical system on my car?
The lower pulley tomthe serpitine belt broke how much willmit cost to fix
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