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Q: why my car do not start on 2007 Cadillac DTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
last months i changed oil of my Cadillac DTS 2007.then I re set. but next morning it did not start then I connected my other car's battery to Cadillac DTS 2007's battery with jumper.after that Cadillac started. then my mechanic suggest me to changed the battery and i did. day before yesterday i did oil changed again and reset. but again same problem happened. this time my mechanic saying that there is no prob with battery. but why when i charge the battery its getting start. i can understand whats wrong with my car.pls help me.
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