At around 100K miles (21 years) I have not yet lost a front spring but have lost 2 rears.
Reason? I can see the front springs more easily to monitor surface rust than the rears. I more recently changed the front springs for new ones, the rears fail at the lower pigtail which you cannot see very well. Forunately rear spring failure is not so dramatic as front ones.
So surface condition is critical for long life?
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