I was confused on how in the world 1 ratio for all could be safe. It all has to do with the synthetic design wether its 24:1 or 100:1. After I finally got it figured out I started using the Amsoil this winter and will use the same mix for lawnmower, weed wacker, and chainsaw. Sure going to beat having 3 mixed gas cans sitting around. Opti 2 is the same thing and all the mix ratio's apply only for regular oil product mixes and not for the engineered synthetics.