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Large oil seal which goes between the Haldex transfer case and the rear differential.
It is strongly recommended that you change it on the drivetrain service as Haldex oil and rear eLSD oil shouldn't mix.
If this oil seal is leaking, then the oil pressure in HALDEX drops, which results in a clutch plates’ premature wear.
If you need a Haldex reparation set or a rear eLSD reparation set, you will require this part to complete the job.