Stabilitrak works to keep the car stable under slippery condition,
hard turns that would cause a spin-out and the like. The only time
you should possibly turn it off is when you have a spare tire (donut)
on the car.
AWD is mostly for traction. Good in snow and other slippery
conditions. While not needed all the time, I'm not sure there are
benefits to turning it off.
Both are essentially the same system. BUT stablitrak also tosses your
ABS and engine controls into the mix.
AWD - all 4 wheels are under power at all times.
Stabilitrak - AWD With traction control. All 4 wheels under power but if
one or more starts to slip the brakes are applied to those wheels until
the rotational speed matches the wheels that are not spinning.
For the least wear leave it in AWD. OR make a few modifications and make
it a rear wheel ot front wheel drive.
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