Every saw chain manufactured by STIHL incorporates exclusive, patented OILOMATIC® lubricating feature. The OILOMATIC® system features specially engineered grooves on both sides of the drive links, channeling oil to the most critical wear areas. This maximizes the use of the bar oil delivering consistent lubrication across the entire chain when in cutting operations. This superior lubrication feature gives you extended chain life with reduced tendency for stretching. The PM offers all of this performance with the added benefit of low-vibration levels, so you can work longer with less fatigue.