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You'll need to flush out the transmission cooler as there's a technical service bulletin on this and install Dextron 6 along with a new filter. This is a synthetic fluid that's compatible with your car and solves the problems with Dextron 3.

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Q: I am thinking of changing to a synthetic fluid in My 2005 Buick Rendezvous which is having shifting problems using Dexron III and would appreciate any recommendations?
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