Diono Radian 3QXT+ expiration date
Diono says the Radian 3QXT+ expires 10 years after the date of purchase, not the date of manufacture. A seat bought in May 2024 can be used until May 2034.
"...expires 10 years from the date of purchase."
From Diono's expiration guide, checked 2026-11-07.
When does my Radian 3QXT+ expire?
Enter the month and year you bought the seat. Diono counts from the date of purchase.
Key takeaways
- Diono Radian 3QXT+: 10 years from the date of purchase.
- Type: all-in-one car seat.
- Diono counts from the purchase date, so keep the receipt.
- If the label prints an expiration date, that date wins.
Where to find the date on the Radian 3QXT+
Look for a white sticker on the plastic shell, usually on the back, the side or underneath. It lists the model number and the date of manufacture, and newer seats often print the expiration date on the same label or stamp it into the plastic.
Replacing an expired Radian 3QXT+
Buy new rather than used: a used seat's crash history and real age are hard to know.
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
When to replace a seat before it expires
- After a moderate or severe crash. NHTSA lists the conditions under which a seat can stay in use after a minor one: car seat use after a crash.
- When the label with the date of manufacture is missing and the maker cannot tell you the date from the serial number.
- When the seat has a recall that has not been fixed. Register the seat with its maker so recall notices reach you.
- When your child is past the seat's height or weight limit, whatever the date.
Before you throw an expired seat out, cut the harness straps and write EXPIRED on the shell so nobody picks it up and uses it.
Other Diono all-in-one car seats
Every lifespan on this page is quoted from the seat maker's own product page, manual or expiration guide, and the quote was checked against that page on the date shown. If the label on your seat prints an expiration date, that date wins.