This means you require 50 parts of gasoline to every 1 part of two-cycle oil. Stihl clearly labels the required ratio next to the fuel filler.
Stihl Oil to Gas Ratio Troubleshooting Guide: Fixing Mixture Problems
" If the label is worn off, consult the original equipment manual or contact a certified Stihl dealer to confirm the specification for that exact model number. You will usually see text like "50:1" or "40:1," sometimes accompanied by the specific oil type, such as "Stihl HP Ultra.
Whether you are trimming branches in your backyard or felling trees on a job site, the precise mixture of two-cycle oil and gasoline powers the engine, and any deviation can lead to poor performance, expensive repairs, or a complete engine seizure. The 40:1 ratio requires 40 parts gasoline to 1 part oil, which translates to roughly 3.
Common Signs of Incorrect Stihl Oil to Gas Ratio and How to Fix Them
6 fluid ounces of oil per gallon of gasoline. Using the wrong ratio—such as pouring 50:1 oil into a tool that requires 40:1—will cause the engine to seize due to excessive oil, while using a 50:1 mix in a 40:1 tool will cause overheating.
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