These comments are for the new-bees out there who are trying to figure it out. It is very easy to get taken by shops if you do not know the mechanics of your equipment. As most shops are out to sell sell sell parts and service. Including dealerships and especially truck stops.. Servicing your equipment your self will get you acquainted with it and prevent most breakdowns on the road. JJ Keller's annual inspection form has a very good description on the back of the check list of what / how . Any questions call someone.