I've been using canola oil for over 10 years. I buy it in 16 litre jugs and use 3 or 4 jugs per year. I asked the Husqvarna rep for western Canada about any problems that might arise and he said there's no problem with using the canola oil as far as warranty is concerned as it has 40% better lubricating properties than mineral oil. He highly recommended using the canola oil.
I do a lot of cutting in winter and the canola oil will get very thick at -30 degrees if you leave it out overnight. If you start with the oil warm in the morning you won't have any problem with cutting all day. I bring my saws and oil into the shop overnight which I keep at +4 degrees and I have no problems. I also make sure to keep my saws cleaned up regularly, including cleaning out the bar rail groove as the oil will build up a gummy deposit eventually if you don't keep on top of it.
