I'm a non-professional who just purchased a used 48" Ferris M12T walk-behind mower with the variable speed hydrostatic transmission. I drained all the fluids but now I need to know what to put back into it. I drained the oil and I also drained the fluid from two other places--the transmission that attaches directly to the wheel shaft, and the transmission control chamber directly above this--it has a plastic cooling fan attached to it as well as a plastic reservoir above it. It has a Kohler 12 hp motor. P.S. It is for sale for $600. Here are three pictures: http://img.villagephotos.com/p/2004-7/774030/ferris01.jpg http://img.villagephotos.com/p/2004-7/774030/ferris02.jpg http://img.villagephotos.com/p/2004-7/774030/ferris03.jpg Thanks.