When I first used my 1025, it overheated and blew off some coolant. I let it cool down, cleaned radiator screen and hosed out radiator. I called dealer and he said to check the screen often. It was my fault as a new owner, I just didn't think it would overheat that fast. I asked him what to add and he said any 50/50. I went to the nearest auto parts store and added Preston yellow 50/50 pre diluted antifreeze coolant. Now that I've been reading the service info it says to use 60/40. Should I drain the coolant and use new JD or will it be ok? Don't want to do damage due to wrong chemicals added via the Preston. Haven't had a problem again. Coming up on a 200 hrs service interval and wondering if I should just change coolant. Also wondering what is involved if I have to such as dran plugs on engine block etc.