Genuine 17117521781 Radiator Drain Plug

Radiator Drain Plug for BMW Cooling Service

This Genuine radiator drain plug is a direct-fit service part for select BMW models equipped with a Genuine radiator and coolant flow adjustment valve. It is used during coolant draining and radiator service on BMW Z4, X1, 328i, 335i, and related xDrive and xi applications.

Key Features

• Genuine replacement radiator drain plug
• Part number: 17117521781
• Fits Genuine radiator only
• Applications with coolant flow adjustment valve
• Selected models with sport transmission and dual plate clutch noted in fitment
• OE-style service part for BMW cooling system maintenance

Fitment Details

• Fits 2009-2016 BMW Z4, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve.
• Fits 2013-2015 BMW X1, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve.
• Fits 2007-2013 BMW 328i, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve.
• Fits 2007-2013 BMW 335i, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve; w/ sport trans w/ dual plate clutch.
• Fits 2009-2013 BMW 335i xDrive, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve; w/ sport trans w/ dual plate clutch.
• Fits 2011-2013 BMW 335is, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve; w/ sport trans w/ dual plate clutch.
• Fits 2009-2012 BMW 328i xDrive, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve.
• Fits 2008-2010 BMW 135i, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve; w/ sport trans w/ dual plate clutch.
• Fits 2007-2008 BMW 328xi, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve.
• Fits 2007-2008 BMW 335xi, N/A; fits Genuine radiator only; w/ coolant flow adjustment valve; w/ sport trans w/ dual plate clutch.

What It Helps Address

• Leaking or damaged radiator drain plug threads
• Coolant draining issues during radiator service
• Improper sealing at the radiator drain point
• Replacement needs after cooling system maintenance on BMW Z4, BMW 328i, or BMW 335i models

Installation Notes

Verify radiator style before ordering: this part fits Genuine radiator only. Confirm the vehicle’s coolant flow adjustment valve configuration and, where listed, sport transmission with dual plate clutch application details. Match part number 17117521781 to the existing drain plug before installation.

Quality Assurance

Genuine OEM-style service part for BMW cooling system applications. Part number 17117521781 is specified for the listed fitments and should be matched to the radiator and configuration notes shown above.