I have a 2000 Kohler 5e generator on my boat, which uses a Kawasaki industrial engine. 2 cylinder, water cooled, 400 cc 16hp. It came with green antifreeze, and I continued to use green. I need to change the coolant again and want to use either Dexcool or Prestone Universal yellow, mostly because the coolant is a real pita to change due to the cramped location. Is there any reason I should not do this ?