I have/use 8 trimmers/chainsaws/blower that use 2 cycle mix. I have been using a 50:1 mix of ethanol free premium and Pro-Mix Premium Synthetic Blend 2 cycle oil in everything for years. Some of the equipment manuals specify a 40:1 mix. Am I doing any long term harm using 50:1 in everything? Most equipment is 1970's - 1990's with one new trimmer (50:1 spec).
I start with a base mix for all my small engines(1gal premium plus 5-6 oz diesel)Some of that is mixed with dino 2t ,50:1 for modern 2 strokes and 32:1 for old 2 strokes.
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