Stihl HP 2-stroke is a mineral oil two-stroke engine oil. Specially developed for Stihl
and other 2-stroke engines. It has excellent lubrication and combustion properties. Performance class: JASO-FB, ISO-L-EGB. Fuel/oil ratio 50:1.
A 100 ml one-shot mixes with 5 liters of fuel for a ratio of 50:1
Unlike a four-stroke engine, whose crankcase is closed except for its ventilation system, a two-stroke engine uses the crankcase as part of the induction tract, therefore, the oil must be mixed with petrol to be distributed throughout the engine for lubrication.