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You can tell if the springs are in need of replacement by a change in the stock suspension setup ride height. BMW measures the ride height by the distance of the bottom lip of the fenderwell directy above the axel to the street. Shocks are really worn out when they start to leak oil, but shocks to degrade over time and you can tell by bouncing the suspension and seeing how many times the car moves up and down before it stops. On BMWs with such tight suspensions this test is not such a good inticator. The best way is to see how the car drives. The suspension loosens up over time due to wear of the many components of the suspension such as ball joints and bushings. If the suspension can't be set to hold the stock alignment, then components are worn to the point of replacement.
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