Hyundai Sonata 1991 Shop Manual page 15

SCHEDULED MAINTENANCE TABLE
MAINTENANCE UNDER SEVERE USAGE CONDITIONS
The following items must be serviced more frequently on vehicles normally used under severe driving conditions.
Refer to the chart below for the appropriate maintenance intervals.
I : INSPECT. CORRECT OR REPLACE IF NECESSARY
R: REPLACE
MAINTENANCE ITEM
MAINTENANCE
MAINTENANCE INTERVALS
DRIVING
OPERATION CONDITION
ENGINE OIL AND FILTER R
Every 3.000 miles (4,800 km)
A. B. C. F. H
or
3
months
AIR CLEANER FILTER
R More frequently C. E
SPARK PLUGS
R
Every 24,000 miles (40.000 km)
B. H
or
18
months
BRAKE PADS. CALIPERS. ROTORS I
More frequently
C. D. G. H
REAR BRAKE DRUMS/LININGS
I More frequently C. D. G. H
STEERING GEAR RACK LINKAGE
I
Every 7.500 miles (12.000 kml
C. D. E. F
& BOOTS or
6
months
DRIVESHAFT & BOOTS
I
Every 7.500 miles (12,000 km)
C. E. F
or
6
months
SEVERE DRIVING CONDITIONS
A-Repeated short distance driving
B-Extensive idling
C-Driving in dusty conditions
D-Driving in areas using salt or other corrosive materials or in very cold weather
E-Driving in sandy areas
F-More than 50% driving in heavy city traffic during hot weather above 90°F (32°C)
G-Driving in mountainous areas
H-Towing a trailer
10-3