The reason for newer less-oil-to-gas ratios is 100% due to emissions-regs. Subquently, most new saws have to use more durable materials to hold up as well as older saws that were not built as durable. Less oil also makes for a slightly richer fuel-mixture that sometimes requires some adusting (if possible).
You're not going to hurt a thing using more oil in newer saws, but you could putting less in older saws. Playing it "safe" is cheap insurance.
I used to use plain-old 30W motor oil back in the 60s. At that time, Sthil called for 20 to 1 and Homelite 16 to 1. In the 1990s, Stihl still called for 20 to 1 with regular oil, and up to 50 to 1 with high-tech two-stroke-cycle oil.
I've been using cheap outboard two-stroke-cycle oil I buy in 5 gallon jugs at a 20 to 1 mix in all my saws- built from the 1950s up to a few new 2010 saws I've got. Zero problems. But, I've also never bought bar oil in my life. I run waste oil and also never had a problem, not even on my 32" bars.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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