Recommended oil? on 2009 Kia Spectra

I just purchased a 2009 Kia Spectra and was wondering what type of oil to use for the vehicle. Conventional? Synthetic? Any help appreciated. Thanks!

Asked by for the 2009 Kia Spectra
We always use synthetic if possible 5w-20 Mobil 1 available at Walmart in 5 quart jugs
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I need to know what oil to use also does new car warranty specify