Spark plugs
Hyundai Sonata / Sonata 2011 Owners Manual / Maintenance / Explanation of scheduled maintenance items / Spark plugs
Make sure to install new spark plugs of the correct heat range.
See also:
Recommended Oil
The engine oil quality should meet the following classification.
API Service SM* or above, ILSAC GF-4 or above
* If the API service SM engine oil is not available in your country, you are
able t ...
52,500 miles (84,000 km) or 42 months
❑ Inspect air cleaner filter
❑ Inspect vacuum hose
❑ Replace engine oil and filter (52,500 miles (84,000 km) or 84 months) ...
Exhaust Emission Control System
The Exhaust Emission Control System is a highly effective system which controls
exhaust emissions while maintaining good vehicle performace. ...


