Ok, I had another company ask me to post this question. Seems they have had 4-5 blowers,trimmers blow up in the last year. they were all run on Optima 2 cycle at 100-1. The owner swore by Optima, even with me, the other employees telling him to just run Shindiawa or red max oil. Even the mechanics are telling him to not mess with mix rates, even if the oil says its ok to mix so lean. They have finally switched to Shindiawa oil and seem to be happy. They have not had a fouled plug since the switch. So has anyone had any 2 cycle equipment fail when using 100:1 oils? At least one was only a year old and they have not heard if the company will warrenty them since they were using 100:1 oil.