Kia Optima Hybrid 2017 Owner's Manual page 562

NORMAL MAINTENANCE SCHEDULE - FOR GASOLINE ENGINE [FOR EUROPE (EXCEPT RUSSIA)]
The following maintenance services must be performed to ensure good emission control and performance. Keep receipts for
all vehicle emission services to protect your warranty. Where both mileage and time are shown, the frequency of service is
determined by whichever occurs first.
NO. ITEM
*1 Coolant (Engine / Inverter)
*2 Engine oil and engine oil filter
*3 Fuel additives (Gasoline)
*4 HSG (Hybrid Starter & Generator) belt
*5 Spark plug
When adding coolant, use only deionized water or soft water for your vehicle
and never mix hard water in the coolant filled at the factory. An improper
coolant mixture can result in serious malfunction or engine damage.
Check the engine oil level and leak every 500 km (350 miles) or before start‐
ing a long trip.
Kia recommends that you use unleaded gasoline which has an octane rating
of RON (Research Octane Number) 95 / AKI (Antiknock Index) 91 or higher
(for Europe) or Octane Rating of RON (Research Octane Number) 91 / AKI
(Antiknock Index) 87 or higher (except Europe).
For customers who do not use good quality gasolines including fuel additives
regularly, and have problems starting or the engine does not run smoothly,
one bottle of additives added to the fuel tank at every 15,000 km (for Eu‐
rope, Australia and New Zealand)/10,000 km (except Europe, Australia and
New Zealand).
Additives are available from your authorized Kia dealer along with informa‐
tion on how to use them. Do not mix other additives.
Inspect HSG belt for evidence of cuts, crocks, excessive wear or oil saturation
and replace if necessary. If drive belt noise occurred, readjust drive belt ten‐
sion before replace.
For your convenience, it can be replaced prior to it's interval when you do
maintenance of other items.
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