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Without oil in the shock, the springs would cause the car to bounce up and down. The oil shock dampens that. In automotive shocks, compression and rebound is controlled by valves in the shock pistons. The compression and rebound can be different in a shock by way of one way valves. The...

Rebound is caused by pressure built up behind the shock piston. It is likely your stock shocks are not as well sealed as the aftermarket ones. This lack of sealing allows the pressure to bleed off, suck air in when the shock is deployed, and bleed back off on compression. The holes in the shock...