The STIHL 11236403201 is a genuine OEM oil pump designed for a range of STIHL chainsaw models, including the MS 021, 023, 025, MS 210, MS 230, and MS 250. This essential component ensures consistent and reliable lubrication of the saw chain and guide bar, which is critical for smooth operation, reduced friction, and extended tool life. Replacing a worn or damaged oil pump with this authentic STIHL part helps maintain the chainsaw's performance and prevents premature wear of cutting components.