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How important is it that I use transmission DexIII when i should be using Dex VI. 2006 Chevy Impala and I'm constantly adding fluid because its leaking somewhere and none of the special atf stop leak or other special transmission leaking fixing products have worked. I go through quite a bit of this fluid and its expensive especially bc it is just going to be leaking out so will it really matter if I use Dex III?
 
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