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Anywhere from 16:1 (8 oz. of oil per gallon) to 20:1 (6.4 oz. per gallon), the lower ratios are better when using castor oil blends; with synthetics like Redline two stroke racing oil, 18 or 20:1 works well. 7 oz. per gallon (18 oz. per gallon) has worked for me for years using Redline.
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