Yes indeed. The third list is like buying a life insurance policy for the engine. The cooling system if it fails will destroy the engine. Disa pin failures can as well but are far less common.
Number 1 and 2 are a given. Everything in bucket 3 are nice things to do to get ahead of the curve, but you will be fine if you wait a few months or have a CEL...which ever comes first. Like I said...it's like buying insurance.
Last edited by x3brian; 01-03-2013 at 02:15 PM.