are they all season tires stock on the car. or summer only on every model?

 

I think they are "all season" that is if you enjoy 0 traction under 50degrees and flat spots on temps under 30degrees.

and no use with any snow.

 

if you plan on using the Z as a daily driver, you better invest in some snow tires. if thats the plan, get some 17's off this forum for cheap and buy snow tires. you will need it. RE040's are arguably the worst tires i've ever had.