When professionals need to fell large trees£¬ in large quantities£¬ they reach for the saw they know has the power to get the job done ?C the MS 661 C-M. Featuring an impressive power-to-weight ratio and STIHL M-Tronic? engine management technology£¬ the MS 661 C-M chainsaw also delivers less vibration and 20% greater fuel efficiency than the MS 660. Other features include a long-life filter system using HD-2 filter elements to provide longer run times between maintenance£¬ an ElastoStart? handle£¬ and a high output adjustable oiler.