Started with Evans originally when Rotax indicated it was better than sliced bread - went to the Orange Dex Cool when I changed out the old brass radiator for the aluminum radiator - both CHT and oil temps ran significantly cooler after the switch - don't know how much of that was due to the coolant and how much due to the radiator. It's going to be easier to find dexcool on a trip if needed compared to evans,





I started out using Mobil-1 Racing 4T, 10W40 (full synthetic) however, changed to Sport 4 (Semi Synthetic) because I don't always have access to lead free fuel on trips.