- A controlled-delivery oil pump for demand-based delivery of oil. This means that lubrication can be optimised for very long cutting attachments or very dry wood, and oil consumption can be reduced in other cases. The STIHL Ematic system ensures that every drop of oil reaches exactly the places it is needed in a targeted manner.
- The routing pre-separator removes coarse dirt particles, relieving strain on the filter itself. You can also retrofit your MS 391 with an HD2 air filter, thereby upgrading it with a long-life air filter system. This will allow you to work for significantly longer without interruption, and reduces the number of filter cleanings required.



STIHL CHAINSAW MS391
MS 391 gas chainsaw: Heavy duty farm saw
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Displacement | 64.1 cm³ |
Displacement | 3.9 cu-in |
Power output | 3.3 / 4.5 (kW/bhp) |
Engine power | 4.4 bhp |
Weight | 6.3 / 13.8 (kg / lbs) 1) |
Device weight without refuelling | 7.44 / 7.6 / 7.74 / 8.06 kg 2) |
Power-to-weight ratio | 1.9 kg/kW |
Bar length | 40-63 cm 3) |
Bar length | 16-25 in 3) |
Saw chain pitch | 3/8" |
Device length with bumper spike | 458 mm 4) |
Sound pressure level | 106 dB(A) 5) |
Vibration level, left | 4 m/s² 6) |
Vibration level, right | 4 m/s² 6) |