How often should springs be changed?

[Court M3]

Just wondering how often do you guys change springs? I have a set of eibach pro and they've been on the car for about 4 yrs now. Only driven around 40k miles.

Just wondering is there a recommended changing period.

[e30Matt]

Springs don't really lose effectiveness with mileage.

[Jand3rson]

Springs don't really lose effectiveness with mileage.

They will start to get squishy, but I don't think after as soon as 4 years.

[george graves]

squishy

how is "squishy" different than springy? - you mean saggie? Or just spongie?

:D

[e30evolution]

they do wear out... driving style/habbits and/or road conditions will effect this... shocks need be replaced more often than springs tho

[mgold]

According to Jay at Ground Control (this man knows everything there is to know about suspensions), coil springs do not sag or wear out unless they have been damaged. The number one cause is rust. Shocks and struts are more likely to fail than springs. However because of the materials used in their construction, leaf springs can sag.