Does anyone know what kind of hydrostatic oil to put in this machine? Dealer is telling me that its non serviceable and shouldn't need any. I was also told that it was due to the machine being cold so the oil was probably thick. Being that the last time I had this issue it was 33 degrees Fahrenheit, I can only imagine if it were below 0. I'd have to refill the fuel tank once it was warm. I've ran this machine for three years now and before I could fire it up and would start snow blowing with in five minutes. Now it has to run for fifteen to twenty minutes before it will move at all. Noticed that the expansion tank is empty cold and that once it warms up there will be a small amount well below the cold line. The oil is also black. Once its warm everything works fine. I'd like to service it or at least top it off but can't find what viscosity of oil to run anywhere.