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been using valvoline dexron 6 with no problems on my 04 cavalier. the shifts feel the same even though dex 6 is lower viscosity.
In theory this is the case, and always will be.
Judging though, nearly new Dex III vs new Dex VI, I find that some shifts are harder.
I'd be hesitant to say that it is typical, common, etc., but whereas with Dex III the shifts were more or less always not perceptible, now I can tell under some conditions.
Could be a lot of things though...
I havent seen valvoline Dex VI anyplace!