2017 KIA OPTIMA PLUG-IN HYBRID spark plugs replace

Engine compartment................................................................ 9-03
Maintenance services............................................................... 9-04Owner’s responsibility.......................................................... 9-04
Owner maintenance precautions....................................... 9-04
Owner maintenance................................................................. 9-06 Owner maintenance schedule.............................................9-06
Scheduled maintenance service............................................. 9-08 Scheduled maintenance service precaution..................... 9-08
Normal maintenance schedule - for gasoline en‐ gine [for Europe (except Russia)].......................................9-09
Normal maintenance schedule - for gasoline en‐ gine [for Europe (except Russia)] (Continued)................. 9-10
Maintenance under severe usage conditions - for gasoline engine [for Europe (except Russia)]...................9-12
Normal maintenance schedule - for gasoline en‐ gine [except Europe (including Russia)]............................ 9-14
Normal maintenance schedule - for gasoline en‐ gine [except Europe (including Russia)] (Continued).......9-15
Maintenance under severe usage conditions - for gasoline engine [except Europe (including Russia)]........ 9-18
Explanation of scheduled maintenance items..................... 9-21 Engine oil and filter............................................................... 9-21
HSG (hybrid starter & generator) belt.............................. 9-21
Fuel filter (for gasoline)....................................................... 9-21
Fuel lines, fuel hoses and connections.............................. 9-21
Vapor hose (for gasoline engine) and fuel filler cap........9-21
Vacuum crankcase ventilation hoses ................................9-21
Air cleaner filter.....................................................................9-21
Spark plugs (for gasoline engine)....................................... 9-21
Cooling system...................................................................... 9-22 Coolant (Engine/Inverter).................................................... 9-22
Automatic transaxle fluid.................................................... 9-22
Brake hoses and lines........................................................... 9-22
Brake fluid ............................................................................. 9-22
Parking brake ........................................................................ 9-22
Brake discs, pads, calipers and rotors............................... 9-22
Suspension mounting bolts................................................. 9-22Steering gear box, linkage & boots/lower arm
ball joint.................................................................................. 9-22
Drive shafts and boots......................................................... 9-22
Air conditioning refrigerant................................................. 9-23
Engine oil.....................................................................................9-24 Checking the engine oil level................................................9-24
Changing the engine oil and filter...................................... 9-24
Coolant........................................................................................ 9-26 Checking the coolant level................................................... 9-26
Engine coolant....................................................................... 9-27
Inverter coolant..................................................................... 9-27
Recommended coolant.........................................................9-28
Changing the coolant............................................................ 9-29
Brake fluid ................................................................................. 9-30 Checking the brake fluid level............................................. 9-30
Washer fluid............................................................................... 9-31 Checking the washer fluid level.......................................... 9-31
Parking brake ............................................................................ 9-32 Checking the parking brake................................................. 9-32
Air cleaner.................................................................................. 9-33 Filter replacement.................................................................9-33
Climate control air filter........................................................... 9-35 Filter inspection..................................................................... 9-35
Maintenance

9

MAINTENANCE INTERVALS
Normal Maintenance Schedule - For Gasoline Engine [For Europe (Except Russia)]
Number of months or driving distance, whichever comes first
Months1224364860728496
Miles×1,0001020304050607080
Km×1,000153045607590105120
MAINTENANCE ITEM
Fuel additives (Gasoline) *3
Add every 15,000 km (10,000 miles) or 12 months
Fuel filter (Gasoline) - I - R - I - R
Fuel lines, hoses and connections - - - I - - - IFuel tank air filter - I - R - I - R
HSG (Hybrid Starter & Generator) belt *4
I I I I I I R I
Parking brake - I - I - I - I
Spark plugs *5
Nu 2.0L GDI Replace every 150,000 km (100,000 miles) or 120 months
Steering gear rack, linkage and boots I I I I I I I I
Suspension ball joints I I I I I I I I
Tire (pressure & tread wear) I I I I I I I I
Vacuum hoses and crankcase ventilation hoses I I I I I I I I
Vapor hose and fuel filler cap - - - I - - - I
I: Inspect and if necessary, adjust, correct, clean or replace.
R: Replace or change.


9-11
9
Maintenance

MAINTENANCE UNDER SEVERE USAGE CONDITIONS - FOR GASOLINE ENGINE [FOR EUROPE
(EXCEPT RUSSIA)]
MAINTENANCE ITEMMAINTENANCE IN‐TERVALSDRIVING CONDITIONDRIVING CONDI‐TION
Engine oil and engine oil filter R Every 7,500 km (5,000 miles) or 6
months A, B, C, D, E, F, G, J,
K, L
HSG (Hybrid Starter & Generator) belt R
Every 45,000 km (30,000 miles) or 24
months C, D, E, L
I Every 7,500 km (5,000 miles) or 6
months C, D, E, L
Air cleaner filter RReplace more frequently depending on
the condition C, E
Spark plugs RReplace more frequently depending on
the condition B, L
Automatic transaxle fluid R Every 90,000 km (60,000 miles) A, C, D, E, F, G, L
Steering gear rack, linkage and boots I Inspect more frequently depending on
the condition C, D, E, F, G
Suspension ball joints I Inspect more frequently depending on
the condition C, D, E, F, G
Brake discs and pads, calipers and rotors I Inspect more frequently depending on
the condition C, D, E, G
Parking brake IInspect more frequently depending on
the condition C, D, G
Drive shaft and boots I Inspect more frequently depending on
the condition C, D, E, F, G, K
Maintenance

9-12

MAINTENANCE INTERVALS
Normal Maintenance Schedule - For Gasoline Engine [Except Europe (Including Russia)]
Number of months or driving distance, whichever comes first
Months1224364860728496
Miles×1,0001020304050607080
Km×1,000153045607590105120
MAINTENANCE ITEM
Engine oil and engine oil fil‐ ter *2
Nu 2.0L GDIExcept Middle East, Brazil: Replace every 15,000 km (10,000 miles) or
12 months
For Middle East, Brazil: Replace every 10,000 km (6,500 miles) or 12 months
Exhaust system - I - I - I - I
Fuel additives (Gasoline) *3
Add every 10,000 km (6,500 miles) or 6 months
Fuel filter (Gasoline) - I - R - I - R
Fuel lines, hoses and connections - - - I - - - I Fuel tank air filter - I - R - I - R
HSG (Hybrid Starter & Generator) belt *4Except Middle East, Brazil: Inspect every 15,000 km (10,000 miles) or 12
months, and replace every 105,000 km (70,000 miles) or 48 months
For Brazil: Inspect every 10,000 km (6,500 miles) or 12 months, and re‐ place every 100,000 km (65,000 miles) or 48 months
For Middle East: Inspect every 10,000 km (6,500 miles) or 12 months, and replace every 50,000 km (30,000 miles) or 24 months
Parking brake - I - I - I - I
Spark plugs *5
Nu 2.0L GDI Replace every 150,000 km (100,000 miles) or 120 months
Steering gear rack, linkage and boots I I I I I I I I
Maintenance
9-16

MAINTENANCE UNDER SEVERE USAGE CONDITIONS - FOR GASOLINE ENGINE [EXCEPT EUROPE
(INCLUDING RUSSIA)]
MAINTENANCE ITEMMAINTENANCEINTERVALSDRIVING CONDITIONDRIVING CONDI‐TION
Engine oil and engineoil filter Except Middle East, Brazil R
Every 7,500 km (5,000 miles) or
6 months A, B, C, D, E, F, G, J,
K, L
For Middle East, Brazil R Every 5,000 km (3,000 miles) or
6 months A, B, C, D, E, F, G, J,
K, L
HSG (HybridStarter &Generator)belt Except Middle East, Brazil
R
Every 45,000 km (30,000 miles)
or 24 months C, D, E, L
I Every 7,500 km (5,000 miles) or
6 months C, D, E, L
For Brazil R
Every 50,000 km (30,000 miles)
or 24 months C, D, E, L
I Every 5,000 km (3,000 miles) or
6 months C, D, E, L
For Middle East R
Every 30,000 km (20,000 miles)
or 12 months C, D, E, L
I Every 5,000 km (3,000 miles) or
6 months C, D, E, L
Air cleaner filter RReplace more frequently de‐
pending on the condition C, E
Spark plugs RReplace more frequently de‐
pending on the condition B, L
Automatic transaxle fluid R Every 90,000 km (60,000 miles) A, C, D, E, F, G, L
Maintenance
9-18

EXPLANATION OF SCHEDULED MAINTENANCE ITEMS
Engine oil and filter
The engine oil and filter should be
changed at the intervals specified in the maintenance schedule. If the vehi‐
cle is being driven in severe conditions,
more frequent oil and filter changes are required.
HSG (hybrid starter &
generator) belt
The HSG belt should be changed at the
intervals specified in the maintenance schedule.
Fuel filter (for gasoline)
Kia gasoline vehicle is equipped a life‐
time fuel filter that integrated with the fuel tank. Regular maintenance or re‐
placement is not needed but depends
on fuel quality. If there are some im‐ portant safety matters like fuel flow
restriction, surging, loss of power, hard
starting problem etc, fuel filter inspec‐ tion or replace is needed.
We recommend that the fuel filter be
Inspected or replaced by an authorized
Kia dealer.
Fuel lines, fuel hoses and
connections
Check the fuel lines, fuel hoses and
connections for leakage and damage. We recommend that the fuel lines, fuel
hoses and connections be replaced by
an authorized Kia dealer.
Vapor hose (for gasoline engine)
and fuel filler cap
The vapor hose and fuel filler cap
should be inspected at those intervals
specified in the maintenance schedule.
Make sure that a new vapor hose or
fuel filler cap is correctly replaced.
Vacuum crankcase ventilation
hoses (if equipped)
Inspect the surface of hoses for evi‐
dence of heat and/or mechanical dam‐ age. Hard and brittle rubber, cracking,
tears, cuts, abrasions, and excessive
swelling indicate deterioration. Particu‐ lar attention should be paid to examine
those hose surfaces nearest to high
heat sources, such as the exhaust manifold. Inspect the hose routing to assure that
the hoses do not come in contact with
any heat source, sharp edges or mov‐ ing component which might cause heat
damage or mechanical wear. Inspect all
hose connections, such as clamps and couplings, to make sure they are se‐
cure, and that no leaks are present. Ho‐
ses should be replaced immediately if there is any evidence of deterioration
or damage.
Air cleaner filter
We recommend that the air cleaner fil‐
ter be replaced by an authorized Kia dealer.
Spark plugs (for gasoline engine)
Make sure to install new spark plugs of
the correct heat range.
WARNING
Do not disconnect and inspect sparkplugs when the engine is hot. Youmay burn yourself.

9-21
9
Maintenance