When do Diono car seats expire?

Diono's expiration policy

Diono's Radian line (Radian 3R, 3RX, 3RXT, the SafePlus versions, the 3QX and 3QXT, and the 3RXT SafePlus Max) lasts 10 years, and Diono counts from an unusual starting point: the date of purchase, not the date of manufacture. If the purchase date cannot be determined, Diono falls back to the date of manufacture. Registering the seat with Diono documents your purchase date.

Ten years is not the whole brand, and this is the detail most owners miss. Diono publishes 8 years for its booster seats and 8 years for the LiteClik 30 infant seats, including when the LiteClik 30 R is sold inside the Quantum 4 travel system. Diono's general "Is my car seat expired?" article still states a flat 10 years from purchase for Diono car seats, so if your seat is a booster or a LiteClik, go by that model's own article rather than the brand-wide answer.

Because most brands count from manufacture, this purchase-date policy can give a Diono a slightly longer real-world life than the label math suggests, but only if you can prove when it was bought. For secondhand seats with no receipt, treat the date of manufacture on the label as the start of the clock.

Diono's support center publishes a lifespan article for each model, and they are the figures we use on the model pages here. Check the article for your exact model and generation, since older Radian generations can differ.

Where is the expiration label on a Diono seat?

The date of manufacture is on the serial label on the seat, on the back or underside of the shell depending on model, along with the model name and number you need for Diono's support lookup and registration.

After a crash

Diono says never use a car seat that has been involved in a moderate or severe collision, applying the NHTSA definitions, and directs owners to contact Diono customer support after any crash to confirm whether the seat needs replacement before it goes back in service.

Flying with a Diono seat

Radian convertibles are certified for aircraft use in harness mode and are popular travel seats because they fold flat and fit narrow airplane seats; the aircraft certification statement is on the seat's label. Booster mode and Diono's dedicated boosters are not certified for aircraft.

Diono is the notable exception to date-of-manufacture expiry in the US market; keep your receipt or register the seat so the purchase date is on record.

Check Diono's recall page and NHTSA's recall lookup for older Radian generations (R100/R120/RXT), which had a recall campaign in 2017.