This debate goes on over and over again, and I will say for me personally I want nothing to do with a liquid cooled zero turn mower engine. The reason I feel this way is because there is no need for me to have a radiator and water pump to maintain when it is not necessary. I just talked with my dealer and he backed up my thinking 100% with the answers he gave to questions I asked. 1) I asked him if he sold any of the big block Vanguards on anything and he told me he did not. 2) I asked him between the Kohler's and Kawasaki's he sells, which did he sell the most of and he said they were even at 1/2 Kohler and 1/2 Kawasaki. 3) I asked him what percentage of liquid cooled engines versus air cooled did he sell. He said he sold about 1% liquid cooled and the rest air cooled. 4) I asked him what service issues he had with engines he sold. He told me there were more problems with liquid cooled and it was not the engines fault but came from needing more maintenance keeping radiators clean. He said people would not put forth the effort to maintain their cooling systems therefore more problems came from this alone, where as with air cooled systems they just blew them off occasionally and they functioned perfectly. He then went on to say, "I have more problems with people maintaining cooling systems on diesels than gas for some unknown reason. I actually have a Kubota in the shop being rebuilt with only 122 hrs. on the machine at this time". I asked him how he ended up with a Kubota and he said the dealer that sold it to the man would not warranty it. The man got mad but could or would not reason that he was the one that caused the engine failure from running it hot and cooking the pistons. He though the dealer should warranty his mistake but the dealer couldn't; so that was where the fall out came from. I just thought this information was interesting so I posted it. There is a tremendous amount of lawn maintenance in the Charlotte, NC and surrounding areas and the view seems to be people want easily maintained gasoline powered air cooled equipment. I know I do, maintaining my Hustler Super Z with the 28 efi could not be any easier or it would be nonexistent.