Coilover rebuild questions

  • I bought Bilstein coilovers during a Group Buy back in 2016 or 2017 (can't remember).

    Just wondering if there is a recommended schedule as far as getting them rebuilt? I think I now have around38-40K miles on them now.

    How much does it cost to have our coilovers rebuilt?

    They still seem to work as I haven't noticed any deterioration in handling, but I seem to recall reading about someone having their Bilsteins rebuilt and paying what they considered to be a reasonable extra cost (??) to have them upgraded to either Double or Triple-Adjustable while they were being rebuilt. I hope I can have them rebuilt and upgraded for around $1-150 more than just a straight rebuild.

    I assume that if I want to have them upgraded to Double-Adjustable during the rebuild process that I probably need to send them back to Bilstein.