Coil Spring Corrosion

[Craig S]

Quick question. I have a 2017 Volvo V40, around 20 months ago, the offside front coil spring snapped, and was replaced under warranty as I had bought the car from a main dealer.

Yesterday, the nearside front coil spring snapped and skewered the tyre. The car has been recovered to the local main dealer (who replaced the offside spring) and I have just had a phonecall to say that they need to replace both the Nearside and Offside front coil springs as the nearside spring is broken but the offside spring is badly corroded.

I was advised by the dealer today that if one spring breaks, both springs should be replaced at the same time.

So a couple of obvious questions.....

1 - Should both springs have been replaced under warranty 20 months ago if that is standard practice?

2 - Am I being unreasonable to expect a coil spring to remain corrosion resistant for more than 20 months/16,000 miles?

Or is this "you need to replace the other spring" just blatant upselling?