Mitsubishi 3A91
In the early years there were problems with floating speeds, but everyone was treated with firmware.
Smart Forfour engines
Smart Forfour is a German supermini class car from Daimler AG line. The first generation of cars was produced from 2004 to 2006, the second from 2014 to the present. Initially, the car was made in the Netherlands and had a lot in common with the model Mitsubishi Colt of the 2003 model. In 2005, a sports version appeared. The second generation of the model is significantly different from the first and is built on a platform with Renault Twingo. For 2015, more than 1.7 million copies of the 2nd generation Forfour have been sold.
The Smart Forfour was offered with 5 engines between 2004 and 2019 (5 petrol). Displacement ranges from 1.0 to 1.5 liters, power output from 61 to 177 hp. 4 use a timing chain and 1 a timing belt. 1 is turbocharged. The longest rated lifespan belongs to the Mitsubishi 4G15T (about 250,000 km).
Smart Forfour engines by generation
| Engine | Years | Volume | Power | Fuel | Timing | Oil | Lifespan |
|---|---|---|---|---|---|---|---|
| Smart Forfour 2004–2006 | |||||||
| Mitsubishi 4A91 | 2004–2006 | 1.5 L R4 | 109 hp | petrol | chain | 4 L | ~225,000 km |
| Mitsubishi 4A90 | 2004–2006 | 1.3 L R4 | 95 hp | petrol | chain | 4 L | ~200,000 km |
| Smart Forfour 1 (W454) 2004–2006 | |||||||
| Mitsubishi 3A91 | 2004–2006 | 1.1 L R3 | 75 hp | petrol | chain | 3.2 L | ~220,000 km |
| Mitsubishi 4G15T | 2005–2006 | 1.5 L R4 | 147–177 hp | petrol, turbo | belt | 3.7 L | ~250,000 km |
| Smart Forfour 2 (W453) 2014–2019 | |||||||
| Renault H4D | 2014–2019 | 1.0 L R3 | 61–73 hp | petrol | chain | 3 L | ~250,000 km |
Smart Forfour engine FAQ
What engines were used in the Smart Forfour?
Smart Forfour (2004–2006): Mitsubishi 4A91 and Mitsubishi 4A90; Smart Forfour 1 (W454) (2004–2006): Mitsubishi 3A91 and Mitsubishi 4G15T; Smart Forfour 2 (W453) (2014–2019): Renault H4D.
Which Smart Forfour engine is the most durable?
By rated service life the most durable Smart Forfour engines are: Mitsubishi 4G15T — about 250,000 km; Renault H4D — about 250,000 km; Mitsubishi 4A91 — about 225,000 km. Actual lifespan depends heavily on maintenance and oil change intervals.
How much oil does the Smart Forfour engine take?
Engine oil capacity with filter: Mitsubishi 3A91 — 3.2 L (5W-30); Mitsubishi 4A90 — 4 L (5W-30); Mitsubishi 4A91 — 4 L (5W-30); Mitsubishi 4G15T — 3.7 L (5W-30); Renault H4D — 3 L (5W-30).
Does the Smart Forfour have a timing belt or chain?
Timing chain: Mitsubishi 3A91, Mitsubishi 4A90, Mitsubishi 4A91 and Renault H4D; timing belt: Mitsubishi 4G15T. Belts must be replaced on schedule: on many engines a broken belt bends the valves.
Was the Smart Forfour available with a diesel engine?
No, all Smart Forfour engines in our database run on petrol.
Engine details
Mitsubishi 4A90
Most often, on specialized forums, they complain about an oil burner, which can start with low mileage.
Mitsubishi 4A91
Reliable in general, the unit is known for its oil burner already at a run of 100,000 km.
Mitsubishi 4G15T
For a turbo engine, this unit is very reliable and does not cause very many problems.
Renault H4D
The main thing is to monitor the cooling system, and especially with the rear engine.
Models with the same engines
- Mitsubishi Colt/Mirage 4 shared engines
- Mitsubishi Lancer 1 shared engine
- Nissan Micra/March 1 shared engine
- Renault Clio 1 shared engine