Amsoil Sig, Series Universal Low Viscosity vs. Dexron VI shift character differences?

Jul 21, 2008
Phila, PA
Wondering what shifting characteristic differences there would be running Amsoil Sig. Series Fuel Efficient vs. GM approved/Licensed Dexron VI? Seems like GM tech's and engineers are really against running a multi-vehicle, non-licensed fluid.

Application 6L80 for:
- `16 Suburban
- `12 Corvette

Note:I have been running Amsoil Sig. Series Multi-Vehicle in 2 Honda's (07 Accord and 06 Odyssey) in place of Z1 for many years, and I am very happy with the firmer quicker shifts. Will I experience the same for a GM application?
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