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Mechanical
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Engine - Pistons/Counterbalance Shafts - Repair (G30)
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11 25 Piston With Rings And Bolts
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11 25 671 Replace the piston rings for all pistons (piston removed) (M550i xDrive, 2018-2019)
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Remove the spiral expander at the oil scraper ring
Remove the spiral expander at the oil scraper ring
Detach the spiral spring (1) in the direction of the arrow.
Courtesy of BMW OF NORTH AMERICA, INC.
Courtesy of BMW OF NORTH AMERICA, INC.