In the car world the mfgr pays the dealership for a new car pdi,install hub caps,ck all fluids make sure perfect condition.in used cars a dealer would include the pdi in price of veh and call it certified if it had all up to date maintenence,70% tires and brakes,good paint etc,a certified veh brings in a little more money but is usually guarenteed to not have defects,on a coach with that low miles basically they are charging you 1700 to change the oil on someone elses trade in
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