Smart Fortwo Maintenance Schedule — 450, 451, 453

Easy 5 min lookup Smart Fortwo 450 Smart Fortwo 451 Smart Roadster 452 Smart Fortwo 453 Smart Forfour 454/453

Service interval: Use this as a planning reference; the workshop manual for your year is the final word

What this is and why it matters

A Smart, like any small modern car, has a maintenance schedule that's based on intervals more than on the dash service light. The dashboard reminder tells you when the manufacturer wants you back in a shop. The schedule below tells you what should actually be checked or replaced at each interval, so you can either DIY it or walk into a shop knowing what you're paying for.

Three things to know up front:

Diesel (CDI) intervals are tighter than petrol. The 451 CDI in particular has a timing belt and stricter oil requirements.
The 453 is on a Renault interval, not a Mercedes interval. Same logic applies — different platform, different schedule.
The dashboard "service due" message is conservative. It's based on time and mileage, not actual wear. Owners who don't drive much can stretch oil intervals slightly past the dashboard nag without harm. Owners who do short trips and city miles should service more often than the dash suggests.

How to use this reference

Find your generation below.
At each milestone, the items listed are what should be touched — inspected, serviced, or replaced.
Where an item says "inspect", you don't always replace at that interval; you look at it. If it's worn, replace.
Where an item is firm (oil, filters), do it at the listed interval.

Service schedule — Smart Fortwo 451 NA / Brabus and Smart Fortwo 453

Interval	Items
Every 5,000 mi (or annually)	Visual inspection (under-car, fluids, lights, tires); oil and filter
Every 10,000 mi	Cabin filter; air filter inspection (replace if dirty); brake inspection (pads, rotors, fluid level); top off washer
Every 30,000 mi	Spark plugs; air filter replacement; transmission service on 453 DCT (Star Diagnosis fill-level); brake fluid flush if 2 years are up
Every 60,000 mi	Serpentine belt inspect or replace; coolant flush; brake fluid flush (every 2 years regardless of miles); rear differential check (453)
Every 100,000 mi	Major service — full inspection, plugs if not done at 30k or 60k, suspension bushings inspect, exhaust system check

Brabus 451 owners — the turbo runs hot. Halve the oil interval (every 5-6k for daily, shorter for spirited driving).

Service schedule — Smart Fortwo 451 CDI (diesel)

Interval	Items
Every 5,000 mi (or annually)	Oil and filter (CDI runs shorter intervals than petrol); visual inspection; fuel filter check
Every 10,000 mi	Cabin filter; air filter inspection; brake inspection; fuel filter replacement on most builds
Every 30,000 mi	Glow plug check; secondary air system check; brake fluid flush if 2 years up
Every 60,000-80,000 mi	Timing belt inspection — replacement window is approximately every 60-80k mi or 6-8 years (verify per workshop manual; this is critical on CDI). See Timing Belt CDI.
Every 100,000 mi	Major service; exhaust system check; injectors on high-mile cars

The CDI's timing belt is non-negotiable. If service history doesn't show it done at the right interval, plan for it before you trust long highway runs.

Service schedule — Smart Fortwo 450 (gasoline 0.6L / 0.7L)

Interval	Items
Every 5,000-10,000 mi (or annually)	Oil and filter; visual inspection
Every 10,000 mi	Cabin filter (where fitted); air filter inspection; brake inspection
Every 30,000 mi	Spark plugs; air filter replacement; brake fluid flush if 2 years up
Every 60,000 mi	Serpentine belt; coolant flush; brake fluid flush (every 2 years)
As needed	Alternator soft-seize check on cars that sit (see 450 Alternator Soft-Seize)

The 450 is old enough now that age-related items (rubber hoses, fuel lines, brake hardware corrosion) are often the reason a car needs work, not the mileage. Inspect over time-based items.

Tire pressures (cold, base load)

Model	Front (cold)	Rear (cold)	Notes
Smart Fortwo 450	28-30 psi (1.9-2.1 bar)	33-35 psi (2.3-2.4 bar)	Verify on door jamb
Smart Fortwo 451 NA / Brabus	32 psi (2.2 bar)	36 psi (2.5 bar)	Higher for full load
Smart Fortwo 453	33 psi (2.3 bar)	38 psi (2.6 bar)	Verify on door jamb
Smart Roadster 452	28-30 psi (1.9-2.1 bar)	33-35 psi (2.3-2.4 bar)	Verify in owner's manual
Smart Forfour 453	33 psi (2.3 bar)	36-38 psi (2.5-2.6 bar)	Verify on door jamb

Always check cold (parked overnight or at least three hours since driving). Smart's staggered pressure is intentional because of the rear weight bias.

Time-based items that don't track miles

A few items wear by time and weather rather than mileage. These are easy to forget:

Brake fluid: Every 2 years regardless of miles. DOT 4 absorbs water from the air.
Coolant: Every 5 years or 60k miles, whichever first. Old coolant loses corrosion inhibitors.
Tires: Manufacture date code. Even a low-mile tire over 6 years old should be inspected for sidewall cracking; over 10 years, replaced regardless of tread.
Auxiliary 12V battery on the 453: 4-6 years typical life. Failures throw weird electrical codes long before the car won't start. See Auxiliary Battery 453 when that page goes live.
Fabric convertible top reproofing (cabrio): Every 2-3 years. See Convertible Top Maintenance.
Cabrio roof sliders (451 cabrio): Approximately every 4 years per Richard Bowden. See 451 Cabrio Roof Sliders.

What this doesn't cover

The full factory service book content. This is a working summary; the manufacturer's workshop manual is the definitive document for your year and trim.
Accessory and option-specific items (panoramic roof seal, AC service intervals, etc.).
Region-specific items — emissions inspections, salt-belt corrosion checks, and so on.
Owner-discretion items (transmission teach-in / adaptation runs on the 451 — recommended if shifts feel off, not strictly on a calendar).

If your car came to you without service history, treat every interval listed above as overdue and walk through them in priority order: oil, brake fluid, coolant, then everything else.

Manual references

Browse Smart workshop manuals on smartcarmanuals.com — model-specific reference manuals on the home page; pick your chassis code section for torque specs and detailed procedures.