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From the 2004 XC90 owner's manual:
Timing belt
For proper functioning of the engine and emission control systems, the timing belt and belt pretensioner must be replaced every 120,000 miles (193,000 km). Engine damage will occur if the belt fails.
PCV system
(on turbocharged models)
The nipple in the intake manifold and the filter at the end of the PCV hose in the air cleaner should be inspected and cleaned at 120,000 miles (193,000 km), and again at 150,000 miles (240,000 km).
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There is no present time, just the past and future
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