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Posted on Jan 02, 2017
The quick/easy answer: Use Stihl (or comparable) two-stroke engine oil at 40:1. A good name brand gas is less likely to gunk up your engine.
The old manual recommended Castrol SAE 40 mixed at 20:1 with regular gas.
All the modern Stihl chainsaw manuals recommend using 90+ octane unleaded gasoline mixed with Stihl two-stroke engine oil at a 50:1.
Since this is an older saw that runs at a lower RPM than modern saws, you probably don't want to run it quite as lean as 50:1. 40:1 is going to be about the right mix
If you want a printed manual for your chainsaw, you can request one here.
Chainsaw collectors corner has some other useful specs here.
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Posted on Jun 14, 2010
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