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HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chain saws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. This oil is biodegradable, degrading by 80% in 21 days.
STIHL recommends a mix of 50:1 high-quality (89 octane minimum) regular unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.
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