Use the Z-3 on the Sy or Ty unless it's been repained with 2 stage paint(base coat & clear coat) as Performin Norman' said
Here's what I use:
Z-1 ,Z-3, Z-5, Z-7, Z-9 & z-10.
Also I recommend getting the Z-18 clay bar.
This process takes a good day to do from the claying to the final Z-3...