I have a Bobcat 600 that needs the system flushed out BEFORE the motor goes back in. I bought a new filter cartridge, but when I pulled the old one out there was black slimy crud (looked like motor sludge) in it and the fluid was milky. I don't really want to put it back together until I can get it cleaned out. Any thoughts on the best way to do this??? I can drain it, but that won't get the crud out of it. I'm not in a big hurry to get it going, I plan on rebuilding all 4 cylinders and doing some other stuff to it, but I would like to get the motor back in first. Any help would be appreciated Thx