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I have inherited my dad's Echo chainsaw - CS-3900, but not the manual. My question is simple - how do I know if I should use a 50:1 or 32:1 oil to gas mixture?

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Oil to gas mixture is more a function of the oil than the saw. If you use high quality oil like Echo brand, (or Stihl or Husqvarna) you'll be fine at 50:1. If the saw is older than 15 or so years you'd be a little safer running 32:1. It'll just smoke a little more at 32:1. I wouldn't worry about it too much.

Posted on Apr 20, 2009

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