[s-cars] Snow Tire Tread Q

[Andrew B]

What's SOP for differing tread depths?  From what I've read, 4/32" is
Audi's recommendation.  How strict is that?  I have a set of snows I
want to mount but my original plan, to replace the one poor condition
tire with a brand new one, may not work as the other three are
slightly worn.  I measured the smallest difference to be about 4/32,
and the largest to be about 6/32", but that's a relatively rough
estimate and the one tire is not yet mounted.  Will mounting these
tires cause significant issues down the line, or will I be fine?
Should I just sell them cheap and look elsewhere?  Or will I be fine
with all-seasons?

Thanks again,
-Andrew