The Dayco hydraulic accessory belt tensioner maintains correct serpentine belt tension on the Bmw X5 accessory drive. Sealed bearing with preloaded spring delivers consistent tension across the full belt life. Replacing the tensioner together with a new belt prevents the documented failure mode where a worn tensioner ejects the new belt within weeks.

Fits: 2000-2024 Bmw X5 (all engine variants).

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Dayco Hydraulic Accessory Belt Tensioner — X5 AT71575