I only have 21 hrs on my new Scag TT / 29 Kaw DFI and love it. When I took the unit home I noticed that the radiator cap had a scrape across the top, and didn't give it a second thought. When the mower had 5-7 hours on it I notice it had lost 1/3 of the antifreeze out of the holding tank on the side engine. I never have been able to see or discover where the coolant has gone. As of this week I had only one ounce of fluid left. My dealer ordered me a new cap and it seems to be a litter tighter fit ( I think). I'll post if the "leaking" stops. Anyone else have this problem with the coolant from this engine?