Is the BMW X5 equipped with a timing belt or chain?

[Jason]

The BMW X5 uses a timing chain, not a belt. Characteristics of chain drive system: The chain drive system offers reliable transmission, excellent durability, and space-saving benefits. The entire system consists of gears, chains, and tensioning devices. The hydraulic tensioner automatically adjusts the tension force to maintain consistent chain tension. This design ensures the chain lasts as long as the engine itself, enhancing safety and reliability while reducing engine maintenance costs—a win-win solution. Timing chain maintenance notes: The sprocket should be mounted on the shaft without tilting or wobbling. For two sprockets in the same transmission assembly, their end faces must lie on the same plane. When the center distance between sprockets is below 0.5 meters, a deviation of 1mm is permissible; for distances exceeding 0.5 meters, up to 2mm deviation is allowed. However, friction against the sprocket tooth sides must be avoided, as excessive misalignment may cause chain slippage or accelerated wear. During sprocket replacement, always check and adjust offset values. Chain tension should be properly adjusted—excessive tightness increases power consumption and bearing wear, while excessive looseness causes chain skipping or disengagement. The optimal tension allows approximately 2-3cm vertical movement at the midpoint between two sprockets.