This MAHLE piston ring set (part number 081 21 N0) replaces the compression and oil-control rings that seal the combustion chamber, control oil film on the cylinder wall, and transfer heat from the piston to the bore. It fits BMW 325i/325is/325iX/525i/528e applications listed in the fitment table below. MAHLE built its reputation on piston and filtration engineering over more than a century and supplies these parts at OE quality across European applications.Technical Details Manufacturer part number: 081 21 N0 Part type: Piston Ring Set Vehicle system: engine cylinder assembly Fitment & CompatibilityUse the fitment table below to confirm year, make, model, submodel, and any application notes before ordering.With over 20 years working on European applications and fitment, PMB Performance can help you confirm the right part. Reach out with your VIN if the application needs checking. Year Make Model Submodel Notes 1987 BMW 325i 1988 BMW 325i 1989 BMW 325i 1990 BMW 325i 1991 BMW 325i 1992 BMW 325i 1992 BMW 325i 1993 BMW 325i 1987 BMW 325is 1988 BMW 325is 1989 BMW 325is 1990 BMW 325is 1991 BMW 325is 1992 BMW 325is 1988 BMW 325iX 1989 BMW 325iX 1990 BMW 325iX 1991 BMW 325iX 1989 BMW 525i 1990 BMW 525i 1991 BMW 525i 1992 BMW 525i 1993 BMW 525i 1987 BMW 528e 1988 BMW 528e
