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Old 09-19-2011, 02:22 AM
  #4  
TopspeedLowet
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Join Date: Apr 2008
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What I have read in Gm's publications on transmission oil is that each newer number can be used for lower number fluids. Dextron 6 supersedes 5,4,and 3. You can use the recommended number fluid for the year or a higher number.
Bruce
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