The revolutionary STIHL 4-MIX engine is the first mixture-lubricated 4-stroke engine from STIHL and combines the advantages of 2-stroke and 4-stroke engines in a single unit. Unlike conventional 4-stroke engines, which require separate systems for the fuel supply and engine lubrication, the new STIHL 4-MIX engine is fuelled with the new 4-MIX fuel mixture. Like all our engines, the 4-MIX must also meet with the basic STIHL principles: simple, reliable and robust. Read on to find out more about the other characteristic properties of 4-MIX engine technology:

The featherweight among 4-stroke engines

Since it is lubricated by the fuel mixture, the STIHL 4-MIX engine can dispense with such parts as the oil pump, oil tank and oil pan needed by conventional 4-stroke engines. This makes the unique STIHL 4-MIX engine a real featherweight.

Easy-to-service engine

Lubrication by the fuel mixture also makes annoying, time-consuming service work - such as regular adjustment of the valve clearance, oil checks, oil changes and disposal of the waste oil - unnecessary with the compact STIHL 4-MIX engine.

Easy to start

So that the STIHL 4-MIX engine can start easily, a decompression system has been installed in the engine to prolong the valve opening times when starting. This considerably reduces the effort required for starting the machine.

Fewer emissions

Because the fuel burns with fewer residues, emissions from the STIHL 4-MIX engine are already more than 25 percent lower than the stringent ceiling imposed by EU regulations which will come into force for small engines in 2007.

Less noise

Even the sound of the new 4-MIX engine is agreeable - particularly when running at maximum level. The effect is advantageous, especially when the machine is used frequently. Whoever spends several hours a day working with a power tool will appreciate the pleasant running noise.

More power

The 4-MIX engine is powerful. Its enormous lugging power, high reliability and long service life make the robust 4-MIX engine ideal for a whole variety of uses.

Conclusion:
The 4-MIX engine which is already used in STIHL brushcutters, hedge trimmers, pole pruners and the CombiSystem represents a major step towards the future in engine technology. It combines the best properties of 2-stroke and 4-stroke concepts in a single engine: it is lighter than a 4-stroke engine, very much more compact, operates in all positions, but with the same low emissions and quietly. In addition, STIHL power tools already conform to EPA requirements and remain distinctly below the specified emission ceilings in some cases.