ATF change @ 18000mi ?

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Hi, I went to the GM dealer today for some service. My Buick has just passed 18,000mi and the tech suggested an ATF flush. I told him the book says ATF flush @ 100,000mi or more (like never). He said the GM techies always recommend ATF flushes @18,000-20,000mi Am I missing something ?
 
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Florida, Cape Coral
Not out of your wallet. Just follow your owner manual and you'll not go wrong. personally I follow the severe matainence schedual regardless for the engine & transmission
 
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