Ikco Pickup Owner's Manual page 90

How to change the fueling label
The validation period of this label is 12
months and you are not authorized to
inject fuel of your automobile without it.
So at least 1 month before completion of
the validity limit of this label, refer to CNG
automobile certified centers.
HOW TO CHANGE THE FUELING PERMIT LABEL
Caution
We strictly recommend all the owners
of CNG vehicles to avoid fuel injection
at CNG fuel filling stations related
to buses and other heavy vehicles
because of its probable damage of
reservoir valve and its belongings.
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