Graco TurboBooster LX vs Diono Monterey 4DXT

Both are booster car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Graco TurboBooster LX	Diono Monterey 4DXT
Stage	Booster	Booster
Narrow (3-across)	–	✓
Extended rear-facing	–	–
FAA-approved	–	–
Lightweight / travel	✓	–

Graco TurboBooster LX

30–110 lb

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Diono Monterey 4DXT

40–120 lb

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As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Weight ranges are the manufacturer's published limits across all modes.

How they differ

the Diono Monterey 4DXT is listed narrow (roughly ≤17″) for fitting three across a back seat; the Graco TurboBooster LX isn't listed narrow
the Graco TurboBooster LX is the lighter, more travel-friendly model

Published limits

Mode	Graco TurboBooster LX	Diono Monterey 4DXT
Booster (with back)	30–100 lb · 38–57 in · 4+ yrs	40–120 lb · 38–63 in
Booster (backless)	40–110 lb · 43–57 in · 4+ yrs	40–120 lb · 38–63 in
Useful life	10 yrs from manufacture	8 yrs from purchase

Diono Monterey 4DXT: Belt-positioning booster convertible between high-back and backless mode (identical weight/height requirements printed for both — no per-mode split found in manual). No age requirement printed. Expired over 8 years from date of purchase (printed number, per manual).

Printed verbatim in the manufacturer's manual (PD329955A · Diono Monterey 4DXT 2-in-1 High-Back Booster Seat Instruction Manual); “—” = not published for that mode, “not yet sourced” = we haven't read that manual yet, not that the seat has no limit. How we source these →

Recall record

Graco — 17 on NHTSA's record · Diono — 2 on NHTSA's record.

That is the record of the brand — not a verdict on these models. A recall names specific models and manufacture-date ranges, and a seat missing from the record is not "recall-free": check nhtsa.gov/recalls with the model and date of manufacture on your seat's label. Source: NHTSA, retrieved 2026-09-05.

Where to buy

Graco TurboBooster LX

See price on Amazon

Diono Monterey 4DXT

See price on Amazon

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FAQ

What's the difference between the Graco TurboBooster LX and the Diono Monterey 4DXT?
The Graco TurboBooster LX is lightweight/travel; the Diono Monterey 4DXT is narrow for 3-across. Both are booster car seats.

Which fits three across, the Graco TurboBooster LX or the Diono Monterey 4DXT?
The Diono Monterey 4DXT is listed narrow (~≤17″) for 3-across; the Graco TurboBooster LX isn't. Three-across fit still depends on your exact vehicle — confirm before buying.

Which is right for my car and child, the Graco TurboBooster LX or the Diono Monterey 4DXT?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

Citing these specs? Go ahead — published manufacturer data, last verified 2026-06-11. Copy a ready-made reference:

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