Ducati DESERTX Owner's Manual page 301

Important
Do not use any additives in fuel or lubricants. Using them could result in severe damage of the engine
and motorcycle components.
Attention
The motorcycle is only compatible with fuel having a maximum content of ethanol of 10% (E10).
Using fuel with ethanol content over 10% is forbidden. Using it could result in severe damage of the engine
and motorcycle components. Using fuel with ethanol content over 10% will make the warranty null and void.
Important
These references identify the fuel recommended for this vehicle, as specified by the European
Regulation EN228.
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