The following items must be serviced more frequently on cars normally used under severe driving conditions. Refer to the chart below for the appropriate maintenance intervals.
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.


Severe Driving Conditions
A- Repeatedly driving short distances of less than 5 miles (8 km) in normal temperature or less than 10 miles (16 km) in freezing temperature
B- Extensive engine idling or low speed driving for long distances
C-Driving on rough, dusty, muddy, unpaved, graveled or saltspread roads
D-Driving in areas using salt or other corrosive materials or in very cold weather
E-Driving in sandy areas
F - Driving in heavy traffic area over 90°F (32°C)
G- Driving on uphill, downhill, or mountain road
H-Towing a Trailer, or using a camper, or roof rack
I -Driving as a patrol car, taxi, other commercial use or vehicle towing
J - Driving over 106 mph (170 km/h)
K-Frequently driving in stop-and-go conditions
Normal Maintenance Schedule
Explanation of Scheduled Maintenance ItemsHyundai Elantra AD (2016-2020) Service Manual: Components and Components Location
Components Location
1. PCV valve2. Canister3. Purge control solenoid valve (PCSV)4. Fuel tank pressure sensor (FTPS)5. Canister close valve (CCV)6. Fuel level sensor (FLS)7. Fuel tank air filter8. Catalytic converter
1. PCV Valve2. Canister3. Purge Control Solenoid Valve (PCSV)4. Fue ...
Hyundai Elantra AD (2016-2020) Service Manual: Cylinder Head Components and Components Location
Components
1. Camshaft bearing cap2. Camshaft front bearing cap3. Exhaust camshaft4. Intake camshaft5. Exhaust CVVT assembly6. Intake CVVT assembly7. Cam carrier8. Cylinder head9. Cylinder head gasket10. Retainer lock11. Retainer 12. Valve spring13. Valve stem seal14. Valve 15. Swing arm16. Hyd ...