Fortwo 451 · 2007–2014

Smart Fortwo 1.0 Fortwo 451 · 71 hp (2007 to 2014)

The Smart Fortwo 1.0 of the Fortwo 451 generation uses the 3B21 1.0 petrol engine with 71 hp.

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Technical specifications

Fuel: Petrol
Power: 71 PS / 52 kW
Displacement: 999 cm³
Cylinders: 3
Engine code: 3B21 1.0
Period covered: 2007–2014
Documented market: Europe

Transmission

Automatic · 5 speeds

Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.

Specification source : [1] AutoKarnet

This version

71 hp (52 kW), rear-wheel drive, 5-speed automatic. Built from 2007 to 2014.

AutoKarnet advice

In the range

It is the entry-level petrol version of this generation.

AutoKarnet advice

Maintenance and records

Oil and filter change

Typical interval: 15,000 km or 12 months, whichever comes first.

15 000 km

12 months

MB 229.3 / MB 229.5 / Renault RN0700 / RN0710 — Engine, model year and severe use may require a shorter interval; do not exceed the service warning. The listed oil approvals are not interchangeable: check the one for the engine.

Source [1]

Brake fluid

Brake fluid: generally replaced every 2 years; inspect the brakes at each service.

24 months

Brake fluid: generally replaced every 2 years; inspect the brakes at each service.

Source [1]

Questions about this version (2)

Which engine is in the Smart Fortwo 1.0 Fortwo 451?

The 3B21 1.0 petrol engine (999 cc), 71 hp (52 kW).

AutoKarnet advice

Which oil for the Smart Fortwo 1.0?

A MB 229.3 / MB 229.5 / Renault RN0700 / RN0710-approved oil suited to the 3B21 1.0 engine.

AutoKarnet advice

Documentary sources

[1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026