At my first isdt race in Germany 1962 I got sponsored by then called optimal oil, where they mixed already 50 to 1 when everyone was mixing 20 to 1. We were called crazy and would not make it one single day. I finished all 6 days and won a gold medal. In the 70’s Opti came to Canada and the USA with improved oil mixing 100 to 1. I have never used anything else and never had a problem. Thank you Opti……,
