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Old 08-05-2012, 05:39 PM   #12
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Coil springs are not considered a wear item. They generally last the life of the car but could be required to be replaced if abused (e.g. off roaded a lot), if damaged (a big hit that causes them to bind), or allowed to rust, which could weaken them but more likely they end up snapping. Cheap aftermarket springs are often made of poorly tempered steel (improper metallurgy) which commonly results in sagging. Most car manufacturers put decently made springs on their cars although Ford did have a bad batch on some very early non SVT Foci which resulted in a service campaign.
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