I've been given the same advice and I follow it. I burned up one of my first bars by letting my bar oil get low. Eventually I think you burn up a bar no matter what, but flipping it will extend it's life. These days I only put half a tank of gas in, fill up the bar oil and then I know I won't run out of bar oil...unless I'm cutting fresh maple, which is so sticky and full of sap that it is a pain in the ass to bob.
Ours seems to be pretty frugal with the chain oil. Mark generally tops it up every tank, but I don't think it's every run out (except for once when the cap was loose and it spilled out....)
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