Page 118 of 175
1998 Volvo S90
1) Replace at 100,000 miles (160,000 km).
2) Brake fluid should be changed at owner request every second year (o\
nce a year if the car is driven in
mountainous areas or in areas with high humidity).
The following items should be checked weekly by the driver (it takes on\
ly a few minutes):
Engine oil level Windshield wipers
Brake fluid level Level of windshield washer fluid
Radiator coolant level
Tire pressure (all five tires)
Operation of all lights
Horns
The following should also be carried out at regular intervals:
Washing
Polishing
Cleaning
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Page 127 of 175

1998 Volvo S90
Check, without removing the cap, that the level is above
the "MIN" mark of the fluid reservoir.
Always entrust brake fluid changing to an authorized
Volvo retailer.
Drive belt pg. 117
Belt check
Check the belt regularly to make sure it is in good
condition and is clean. A worn or dirty belt can cause poor
cooling and low generator output as well as impair the
operation of the power steering and the air conditioning
unit.
WARNING! The engine must not be running when
this check is performed. NOTE: The belt is equipped with a self-questioning
mechanism and requires no adjustment between changes.
Cooling system pg. 118
Changing coolant
Normally, the coolant does not
need to be changed. If the system
must be drained, use the following
procedure:
Remove the expansion tank cap.
Open the drain cock on the right
side of the engine block and
disconnect the lower radiator
hose.
Fill coolant through the expansion
tank. The heater controls should
be fully open when draining and
WARNING: If the engine is
warm and you are going to top
up coolant, unscrew the cap
slowly in order to allow any
excess pressure to escape.
NOTE: Do not top up with water
only. Water by itself reduces the
rust-protective and anti-freeze
qualities of the coolant and has a
lower boiling point. It can also
cause damage to the cooling system
if it should freeze.
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Page 174 of 175

1998 Volvo S90
The following should be
checked regularly:
Coolant level should be
between the expansion tank
marks. Mixture: 50% anti-
freeze and 50% water. See
page 118.
Power steering - When
cold, the level must not be
above the COLD mark and
when hot it must not be
above the HOT mark. Top
up if the level drops to the
ADD mark with ATF fluid.
See page 116.
Engine oil - level should be
between the dipstick marks.
The distance between the
marks represents approx. 1
US qts. (1 liter). See page
108.
Brake fluid - check,
without removing the cap,
that the level is above the
MIN mark. Use brake fluid
DOT 4+. See page 116.
Washer fluid - reservoir
should be filled with water
and solvent (wintertime:
windshield washer anti-
freeze). See page 119.
Octane rating, see page 55.
Tire pressure, see label located on
the rear edge of the right front
door.
Bulbs Power Socket US Bulb
No.
1 70 W HB3/9005
2 60 W HB4/90006
3 5W BA 15
s 67
4 21 W BA 15
s 1156
5 21/5
W BAY
15 d
1157
6 21 W BAU
15 s –
7 21/5
W BAY
15d
1157NA
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