The STIHL 4-MIX® engine is the first four stroke engine which works on a mixture of petrol and oil. It combines the advantages of four-stroke and two-stroke engines in one. With higher torque and up to 80% less emissions and a deeper more pleasant sound. Easy to start due to the decompression system and manual fuel pump. With AutoCut mowing head. A great tool for landscapers and large property maintenance.