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There's something like 300psi of nitrogen gas in Bilstein shocks. The reason is to keep pressure on the oil that goes through check valves and orifices to dampen the springs or torsion bars on jounce or compression and mostly on rebound... the gas pressure is to keep the oil from being aerated or frothing inside the shock over repetitive bumps
If the nitrogen gas does not leak out then the shocks expansion leading to increased ride height does not change or break in.
If it did, Bilstein would be a lousy and inferior shock absorber.
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