Do not run 2 cycle oil. Do use Bio. As stated, there are failures but the number is highly exaggerated. There was some info posted over on FTE, that additives can strip the coating off of the water separator and let water through. I often wonder how many failures happen that have been caused by contaminated fuel, ie: DEF or gas. If you do run an additive, use one that separates the water so the filter can do it's job, not an additive that emulsifies it.