Kia Optima 2017, Owner'S Manual, Page: 629 / 776

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.
Drive belts
Inspect all drive belts for evidence of
cuts, cracks, excessive wear or oil satu‐
ration and replace if necessary. Drive
belts should be checked periodically for
proper tension and adjusted as neces‐
sary.
CAUTION
When you are inspecting the belt,
place the ignition switch in the
LOCK/OFF or ACC position.
Fuel filter cartridge (for diesel)
A clogged filter can limit the speed at
which the vehicle may be driven, dam‐
age the emission system and cause
multiple issues such as hard starting. If
an excessive amount of foreign matter
accumulates in the fuel tank, the filter
may require replacement more fre‐
quently.
After installing a new filter, run the en‐
gine for several minutes, and check for
leaks at the connections.
We recommend that the fuel filter be
replaced by an authorized Kia dealer.
Fuel filter (for gasoline)
Kia gasoline vehicle is equipped a life‐
time fuel filter that integrated with the
fuel tank.
Regular maintenance or replacement is
not needed but depends on fuel quality.
If there are some important safety
matters like fuel flow restriction, surg‐
ing, loss of power, hard starting prob‐
lem etc., fuel filter inspection 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.
WARNING
n
Diesel only
Never work on the injection system
with the engine running or within 30
seconds after shutting off the en‐
gine. High pressure pump, rail, injec‐
tors and high pressure pipes are
subject to high pressure even after
the engine stops. The fuel jet pro‐
duced by fuel leaks may cause seri‐
ous injury, if it touches the body.
People using pacemakers should not
more move than 30 cm closer to the
ECU or wiring harness within the en‐
gine room while the engine is run‐
ning, since the high currents in the
Common Rail system produce con‐
siderable magnetic fields.
8-43
8
Maintenance