PIAGGIO X8 400 i.e. Owner's Manual page 54

e) Top up the cooling fluid if the fluid level is below the minimum level margin inside
the expansion tank.
The fluid level must always be between MIN and MAX level
If the fluid is near the minimum level, proceed with the top-up operation to be carried
out when the engine is cold. If it is necessary to top up the coolant frequently, or if the
expansion tank is completely dry, you should look for the cause in the cooling system.
It is therefore indispensable to have the cooling system checked at an Authorised
Piaggio Service Centre.
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The coolant should be replaced every 2 years. For this operation, please contact an
authorised Piaggio service centre.
N.B.
IF DURING A NON-DEMANDING RIDE THE COOLANT WARNING LIGHT COMES
ON, SHUT OFF THE ENGINE AND ALLOW IT TO COOL DOWN. THEN CHECK
THE COOLANT LEVEL; IF THE LEVEL IS NOT CORRECT, CONTACT AN AU-
THORISED SERVICE CENTRE.
WARNING
WHENEVER REFITTING THE EXPANSION TANK FILLER CAP, PLEASE ENSURE
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IT IS CORRECTLY TIGHTENED SO AS TO AVOID LEAKAGE IN THE CIRCUIT.
WARNING
TO AVOID THE RISK OF SCALDING, DO NOT UNSCREW THE EXPANSION
TANK COVER WHILE THE ENGINE IS STILL HOT.
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