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Fuel mix 50:1 vs 40:1

2090 Views 6 Replies 7 Participants Last post by  slow wrench
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).
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Modern 2 cycle oils can be run at 50-1 in anything. Modern equipment can be run at 40-1. Go over to Arboristsite and read a few of the endless oil debates about oil brands and ratios. I have about 10 old saws, trimmers and newer blowers, I run everything on 3 1/2oz Lucas simi synthetic oil- 1oz Seafoam-gallon of 87oct with ethonal. After 48 years of of owning 2 strokes, that's where I've end up.
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