I am signing the paperwork on an L/Certified 2014 CT with 28K today. My warranty will take me to March 2020 but have option to purchase Lexus Extra Care to extend to 2023. The extra cost comes out to be $3600. Of course it's presented as 'only' $48 extra a month. My question is, am I better off shopping for Extra Care closer to when the warranty expires in 2020? Would I expect it to cost much more at that time? Btw, Im in CA. Thanks!