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Fuel mix 50:1 vs 40:1

2089 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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If you are using 50:1 in something calling for 40:1 you are not providing enough lubrication and yes it will eventually cause problems. There are reasons that manufacturers indicate a specific fuel mix. And conversely using 40:1 in a tool requiring 50:1 is providing too much oil and can cause fouled plugs
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