The STIHL 11436403200 oil pump is an original equipment manufacturer (OEM) part designed for specific STIHL MS 251 series chainsaws. This genuine oil pump ensures efficient and consistent lubrication of the saw chain and guide bar, critical for smooth operation and extended tool life. It is a direct replacement part, maintaining the performance and reliability of your STIHL chainsaw models including MS 251, MS 251 C, MS 251 C-BE, and MS 251 C-BEQ.