I use paraffin, with the crockpot method. I don't know if it makes my chains last longer, but it does make sure I don't get oil on my pants. Considering that my two chains have about 2-3k miles and no indication of wear, I'm sure I'll get enough use out of them. I get at least 400 miles between waxes. If I had to do it every 200 I might switch back to oil.