Went to walmart to get a few things and remembered I needed 6 qts of Dex III for my 4l60 fluid drain. After looking for a few moments, I discovered walmart (mine anyway) only carries two brands of DEX atf: Supertech (their generic brand) and Castrol "Dec/Merc" which is described for both gm and ford cars. Is this OK to use in my 4l60e? Or should I get the Castrol Dex VI which is SYN...?
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