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Hey guys, this is my first post. I didn't see anything like this exactly so I apologize if there's a post like this already.

I've recently made an attitude change in my life where I'm trying to save lots of money and do things myself instead of wasting money. I just sold my 2011 Hyundai Genesis Sedan R-Spec! I had the Civic independently inspected and they indicated it's almost perfect.

I've never done any car maintenance myself so I was wondering if there's anything I should probably get to work on to make sure it keeps running smooth to 500k miles.

In addition I was thinking I would change the oil now just because. I can look up a YouTube video on how to do it, but I'm getting mixed results on what oil I should use, if I need one or two jacks, and how much oil I should use.

 
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1st order of business should be your 15 year old timing belt (7 years is the rated time interval)