For years, I have done my cars 2x/yr. Track car would often get an extra mid season touch up..
I have been very happy with the spring Mother's 1, 2, Collinite 845 job. In the fall, I would usually do a Mother's 2 (if needed), Collinite 845 job before winter. Because all cars are garaged, I may not do Mother's 1 every spring esp on the cars that park in winter. I have never seen the 845 "used up" yet.
I want to make sure I give my new GTS the best out there so here I am!