BMW Repair Kit Piston Rings (25) - Genuine BMW 11257511699

Product Information

BMW Engine Block and Components diagram for 325Ci, 325i, 325xi, 525i, X3, Z3, Z4

An engine piston ring set consists of multiple rings that fit into grooves around each piston. Their main roles are to seal the combustion chamber, regulate oil consumption by scraping excess oil from cylinder walls, and transfer heat from the piston to the cylinder wall. Typically, a set includes compression rings (for sealing combustion gases) and oil control rings (for managing lubrication).

• Excessive exhaust smoke (blue or gray), caused by oil leaking into the combustion chamber.
• Loss of compression and power, leading to poor acceleration and misfires.
• High oil consumption, requiring frequent top-ups due to oil burning inside the cylinders.

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.