You need to look at it a different way. Figure out what a new bar costs. Then figure the price difference between a high
price oil and a cheap oil. Will your bar last past the point of breaking even? If so it's a no brainer. I run the cheap stuff and I have a 150 plus cords on my bar. It's a 16" Oregon bar. It's also on a modded 261 so it runs some rpm.
Scott