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Fuel/Oil MixtureUse a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few months. Anything over 3 months old use up in a 4 cycle engine. HTH
Lou
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SOURCE: Fuel Mixture Husqvarna 455 Rancher Chain Saw
Page 17 of your Operator's Manual says 50:1.
Fuel/Oil Mixture
Lou
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