I don't see the reason either, all my saws use .050 except for the one stihl .063. I have heard the oil theory as well. I don't buy it. It's only .008 difference. Most huskys oil pretty good anyway.Yeah it’s interesting, my 55 uses a .050 20” bar and I would have liked to keep it consistent for compatibility. I am honestly not entirely sure why they make .058s. I was reading they helps get a little extra oil to the end of the bar, especially on longer bars. I’m not sure if there is anything to that though, or that a 20” bar would count as long. I guess chalk it up to curiosity mostly as I’ve never had one.
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