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If your having issues with carbon build up etc, look at your jetting, not your oil mixture (unless you dropped in 500mls in 5lts by mistake). I have 30 year old saws that started their lives on 25:1, and when I went over them years later, they were clean inside, no carbon build up, no stuck...

its such a small difference, you may need to adjust your jets, but your only talking a very small amount if at all, I find you adjust more for weather conditions than oil ratios. personally I run 150mls in 5lts, or 32:1 mineral 2t castrol oil in all my equipment.