SeatCheck
All-in-one car seat

Diono Radian 3R expiration

The Diono Radian 3R expires 10 years after its date of purchase.

Useful life
10 years
Type
All-in-one
Brand policy
8–10 years

Check your Radian 3R

What to know

Same 10-years-from-purchase policy as the rest of the Radian line. Diono's support article puts the 3R's booster mode at up to 120 lb and 57 in, so it converts through all three modes rather than stopping at forward-facing harness.

The date of manufacture is on the seat itself. 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.

Safety note: SeatCheck summarizes manufacturer and NHTSA guidance, but the label on your own seat and its manual are the final word. When in doubt, contact the manufacturer with your model and serial number.

More about Diono seats

Full policy, label locations and crash-replacement rules on the Diono brand page.

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Frequently asked questions

How long is the Diono Radian 3R good for?
The Diono Radian 3R has a useful life of 10 years from its date of purchase. Diono counts from purchase rather than manufacture, so keep the receipt or register the seat; if the purchase date cannot be established, the date of manufacture on the label is used instead.
Where is the expiration date on the Diono Radian 3R?
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.
Should I replace the Radian 3R 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.

Sources