Used Car GST Payment-Reg

I have Owned a car and used that car for my personal use.Now I am going to sale that car shall I get GST With the buyer then how much rate of GST I will get with the buyer.In which Service it will covers and pay that tax.I came to know that used vehicles attracts 12% or 18%(As per notification No.8/2018 dt:25-01-2018).Kindly Clarify.