What are the best type of spark plugs to use in this engine? What is the best way to remove plugs at 120,000 miles? I have a 2013 model. Shoud the enigne be hot or cold for removal? What is a good brand of serpentine belt to use for after market?

 

The vehicle manufacturers do extensive testing to come up with a plug that will perform best under all circumstances. You might switch to certain aftermarket plugs for different reasons., some work better some don't. For general use , best to stick with OEM.

If you blow out all the junk in the spark plug holes , most times plug removal is easier when engine has cooled down.
.Most aftermarket belts will do the job, and if you purchase locally, you wind up buying whatever brand the store carries. With your attention to maintenance, as noticed here, you shouldn't have any problems, nice to see someone is watching these things. It pays off well in the long run.

If they are the original plugs still in the vehicle, it's overdue.Make sure the gap is set to spec for your particular vehicle.

 

I like NGK spark plugs.

 

I keep my vehicle stock so I like the OEM spark plugs. I ordered fromhttps://www.hyundaipartsdeal.com/] https://www.hyundaipartsdeal.com/[/url] and I got a nice deal with fast shipping.