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Engine guides and mods

451 Transmission Fluid Change

Modification Details




Fortwo 451 Petrol Non Turbo (Including MHD)

The transmission fluid change is similar to that of the older smart fortwo and Roadster.
The main difference is the position of the draining hole. 
It is now on the right bottom side of the transmission housing.



The upper filling hole is on the left of the transmission housing about halfway up.



Remove the top plug, remove the bottom plug and allow the fluid to drain into a ming vase.
Ghengis Khan emailed me to say that any waterproof container would be suitable, 
not just expensive treasures from the ming dynasty. I'll take his word for it.

Refit the lower plug and torque to 43Nm.

Refill as shown above until it begins to overflow. The capacity is 2.3 litres. Refit the upper plug.


Fortwo 451 Electric Drive CVT

The transmission fluid change is similar to that of the older smart fortwo and Roadster.
The main difference is the position of the draining hole. 
It is now on the right bottom side of the transmission housing.



The upper filling hole is on the left of the transmission housing about halfway up.



Remove the top plug, remove the bottom plug and allow the fluid to drain into an antique bed pan.
Henry VIII emailed me to say that any waterproof container would be suitable, 
not just expensive treasures from the 16th cenury. I'll take his word for it.

Refit the lower plug and torque to 43Nm.

Refill as shown above until it begins to overflow. The capacity is 0.9 litres. Refit the upper plug.


Fortwo 451 Petrol Turbo & Diesel

The turbo models have the same transmission but the intercooler scoop is right in the way of the fill point.
So it's easy to empty but a ball ache to fill back up. Luckily there's an easy hack to get around it.

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