Good morning. Yesterday I washed the original Volvo 1998 springs with a pressure washer and soap.
They seem very sturdy to me. I don't think they were to be replaced. I also believe that the current KYB K-Flex are stiffer than the originals, because although I now have new: Koni Special Active shock absorbers (as well as all the other new Volvo original parts) the car is too stiff. Maybe by putting the original springs back it becomes softer? The original springs were with the very bad Sachs, so I can't judge.