When my Stihl dealer learned that I used canola oil he went into a 15 minute lecture on how I was destroying my saws. I noted that I've used canola for about a decade now and only had one saw in the shop in that time and it was a $34 fix. I explained that I mostly cut wood on my land and eat a ton of wild edibles and did not like the idea of spraying petroleum on my food. He said that he called Stihl and they assured him that their regular oil poses no health risk--so he stopped carrying their bio-oil (which incidentally is marketed as being safer for people, plants and animals). Admittedly, I'm a skeptic of any large corporation, but I decided to change the topic since I generally like the guy and he knows saws.