RACEORLY Number：. Mini N12 / N16. Cooper 2007-2013 R56. Clubman 2007-2014 R55. The third oil ring is upgraded with a split design. It can also boost the durability of piston rings, make the load distribution reasonable among ring pieces, extend the maintenance cycle, cut user's maintenance cost and vehicle maintenance frequency, and ensure the efficient and stable operation of the engine.
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