SMART forfour Operating Instructions Manual page 178

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>Note!
The petrol engines (except 130 kW) are
designed to run on unleaded petrol with a
minimum grade of 95RON/85MON.
In countries where a minimum grade of
95RON is not available, you can refuel with
91RON unleaded petrol. This should only
be done in exceptional cases, however.
This, however, can reduce engine output
and increase fuel consumption. When
subjected to heavy loads while burning
grade 91RON fuel, engine damage could
result.
As such, smart recommends that you al
ways run your petrol engine on unleaded
petrol with a minimum grade of 95RON/
85MON.
>Note!
The 130 kW petrol engine is designed to
run on unleaded fuel with a minimum
grade of 98RON/88MON.
In countries where unleaded petrol with a
minimum grade of 98RON is not available,
you can refuel with 95RON petrol in an
emergency.
This, however, can reduce engine output
and increase fuel consumption. When
subjected to heavy loads while burning
grade 95RON fuel, engine damage could
result.
As such, smart recommends that you al
ways run your petrol engine on unleaded
petrol with a minimum grade of 98RON/
88MON.
Refuelling
Routines 8 3