Amsoil Saber oil is designed to run at 100:1. Amsoil says it is okay to mix it down to about 65:1, should you feel you need that extra lubrication, but you should never mix Saber more than 50:1. If you want to run an Amsoil product more than 50:1 you need to order there competition Dominator 50:1 oil. Hope this helps answer you question a little better than has been so far. Good luck.