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I will be replacing the struts and shocks on my car soon. I did them last about 80000 km ago, but at that time I did not replace the springs.

Do springs wear out over time?

Should I replace them this time around? None of the springs are damaged in any way, but they do have just under 200000 km on them.

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Springs do wear out overtime or with severe duty use. You can determine if they are sagging by checking the ride height. Where this measurement is taken and what is normal varies with each vehicle type and brand. They spring is what determines ride height as it the component that is supporting the vehicles weight. One of the leading causes of spring failure is worn struts. The struts control the rate at which the spring compresses and extends. Worn struts allow the spring to move to quickly and results in metal fatigue. You may want to consider buying loaded struts. The strut comes as an assembly with a new spring. They are generally cheaper than buying the parts separately and there is a labor savings since the old struts don't need to be disassembled. Since most of us don't have a strut compression tool to remove the spring buying the entire assembly can turn it into a DIY project for additional savings.

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However, a hand-tool spring compression tool isn't really that expensive (on the order of $25-50 US). If your springs are fine, there's no reason to spend the extra money there. – Bob Cross May 1 '14 at 11:32
@BobCross ... Harbor Freight is a good source for cheap ones. Agree with the point of not spending extra money where it's not required. – Pᴀᴜʟsᴛᴇʀ2 May 1 '14 at 15:42

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