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The OEM part number is: 18847-11160

You can find them all over amazon and ebay, such as: [ame]https://www.amazon.com/Genuine-Hyundai-Spark-Plugs-18847-11160/dp/B008N2JQLQ[/ame]

I have gotten the plugs for my 2.0T from korean auto parts store on ebay for WAY cheaper than any dealer or other website.
 

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2011 Sonata GLS 2.4 engine.
114K miles, time for new plugs?

Which brand/part# is needed? Any good online source?
I have 153,355 miles...I have checked one plug for appearance and gap. As far as I know they were never changed (OEM plugs). I get low 40's mpg and leaving everything as it is! Been down that road and it hasn't paid off!
 

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The turbo models had plug changes to colder plugs. I do not believe the 2.4s had the same issue and changes.
 

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Plugs can sometimes seize in place, just removing for a check IMO is a good idea.

Rockauto is quite good for online plug buying.
 
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