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....)

Great tip!

I hope it extends the life of your chainsaw (or at least the bar.)