Question: how long are diono car seats good before they expire?
Answer: Diono Radian models expire 10 years from date of purchase and approved for the use of harness mode for 8 years and up to 10 years in booster mode. Diono Rainier, Pacifica and Olympia expire 10 years from date of purchase and approved for the use of harness mode for 8 years and up to 10 years in booster mode.