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Like i said want to see a big improvement in noise go to royal purple oil 10w30 summer 5w30 winter it makes a huge difference. As a matter of fact I use it in my series 60 also huge improvement. A must with the apu wash out the air filter on the HVAC unit!:)

I don't know what you guys are doing with your carrier apu's? i have 4125 hrs on mine without a hitch? Cooling power well in a Classic XL it cools to whole cab no sweat no matter how hot it is. As far as belts the goodyear belts are way better the ones from carrier only last about 1000hrs I...