Kozlira Serpentine Belt Tensioner Kit for BMW 3.0L L6 (2006–2013) idler pulley, V-ribbed belt, steel bolt

Kozlira's complete serpentine belt tensioner, idler pulley, bolt and V-ribbed belt kit replaces worn drive components on select BMW 3.0L L6 engines from 2006–2013.

This OE-style drive kit packages the tensioner assembly, idler pulley, updated steel tensioner bolt and an exact-fit V-ribbed belt so you can restore accessory drive performance on many BMW 128i, 325i, 328i, 330i, 525i, 528i, X3 and X5 models. Parts are selected to match factory reference numbers and common aftermarket fitments, reducing installation guesswork and helping return smooth belt routing, controlled tension and quieter operation.

Which BMW models and years will this Kozlira kit fit?

The kit covers a range of BMW vehicles equipped with the 3.0L L6 engine across model years roughly 2006 through 2013. It includes specific fitments for coupe, sedan and SUV applications, including many xDrive variants where listed.

• BMW 128i (2008–2013)
• 325i / 325xi / 330i / 330xi (2006–2007), 328i / 328i xDrive and 328xi (2007–2013 depending on model)
• 525i / 525xi / 528i / 528i xDrive / 530i / 530xi (2006–2010 depending on model)
• X3 (2007–2010) and X5 (2007–2010) 3.0L L6 where specified (note exclusions apply for Adaptive Drive or 4-zone climate on some X5s)

What components are included and how do they match OEM references?

This kit contains the core drive components required when replacing a failing serpentine system: the tensioner, the idler pulley, the V-ribbed belt and the updated mounting bolt. Each part maps to common BMW reference numbers so you can verify fitment against your vehicle’s stamped part numbers or dealer information.

• Tensioner: matching references 11288624196 and 11287530314
• Idler/deflection pulley: reference 11287535860
• V-ribbed belt: several BMW part references including 11281628650, 11287527564 and 6K1990
• Tensioner bolt: upgraded steel bolt 11287530315 for improved strength

Why has Kozlira upgraded the tensioner bolt and what difference does it make?

Users reported durability issues with softer bolt materials, so Kozlira replaced the original aluminum-style fastener with a higher-strength steel bolt. The steel bolt resists stripping, reduces loosening under vibration and improves longevity under repeated torque cycles during installation and service.

• Steel construction for better shear and tensile strength
• Improved thread retention and resistance to stripping
• Designed to match original dimensions for straightforward installation

How does replacing the tensioner, idler and belt affect vehicle operation?

Worn belts, a fatigued tensioner or a rough idler pulley can cause squeal, belt slip or uneven accessory drive operation. Replacing these items as a set restores consistent belt tension, reduces vibration and helps accessories such as the alternator, power steering and A/C run reliably.

• Restores correct belt routing and tension to reduce slip
• Limits drivetrain vibration and accessory noise
• Helps prolong life of the new belt and related pulleys

Who is this for: This Kozlira ADK0022P kit is intended for BMW owners, independent mechanics and DIY enthusiasts working on 3.0L L6 BMW models from the 2006–2013 era who need a complete, OEM-referenced replacement for a tired serpentine belt system. Choose this kit if your car shows belt noise, visible belt wear, play in the tensioner or rough idler pulley bearings. Always confirm compatibility using your vehicle’s VIN and part numbers before purchase, and consult a qualified technician for installation if you're not comfortable performing belt-system service yourself.