Use Mercon V in 1999 Grand Am automatic

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I have a case of Mercon V, and I have a 1999 Grand AM with the auto tranny. Can I use this fluid in the transmission? I am thinking it has to be a better quality fluid than the Dexron III in there now.
 
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Dec 5, 2007
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panhandle of florida
Valvoline and most other mercon V's say they are compatible with dex III. The only one that I've seen that doesn't say that is Castrol. What brand is it?
 

Bluestream

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Thanks Guys, I am guessing this is more like one of the "Multi-Vehicle ATF's" than a pure Mercon V. I actually called them and they said it meets DEXRON III, but theu just can't say that anymore
 
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