Is the BMW X5 timing belt or chain? UK guide

The BMW X5 uses a timing chain rather than a timing belt. Timing chains are more durable and typically last the lifetime of the engine, unlike belts which require regular replacement. In the UK market, this applies to all current BMW X5 models including popular variants like the xDrive30d and xDrive40i. Timing chain systems consist of gears, chains and tensioners with hydraulic tensioners that automatically maintain proper tension. While more reliable than belts, chains still require proper maintenance - ensure correct alignment of sprockets (within 1mm tolerance for under 0.5m centres, 2mm for over) and maintain proper tension (2-3cm movement at midpoint). Common UK models like the 2024 BMW X5 xDrive30d benefit from this durable system, reducing long-term maintenance costs compared to belt-driven alternatives.