Lexus IS220d 2012 Manual page 584

6-1. Specifications

Fuel tank opening for unleaded gasoline (IS250)
To help prevent incorrect fueling, your Lexus has a fuel tank opening that
only accommodates the special nozzle on unleaded fuel pumps.

If you plan to drive in foreign countries (IS220d and IS200d)
Low sulphur diesel fuel may not be available, so please confirm the avail-
ability with your distributor.

If premium gasoline is not available (IS250)
If this premium type cannot be obtained, you can temporarily use unleaded
gasoline with a Research Octane Number as low as 91.

If your engine knocks

Consult any authorized Lexus dealer or repairer, or another duly quali-
fied and equipped professional.

You may occasionally notice light knocking for a short time while accel-
erating or driving uphill. This is normal and there is no need for concern.
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