In every T-GDI vehicle that we had, I ran Mobil 1 EP 5W-30, and it did very well. We had a 2013 Hyundai Sonata 2.0T (fuel diluter) and a 2013 Hyundai Santa Fe Sport 2.0T, a fuel diluter. It doesn't matter if she commutes or short trips. Every time that engine has to do, be in stoichiometric rich burn mode, aka put your foot down to get more power, more fuel gets dumped into the oil. That's because, in GDI engines, fuel atomization is very poor. This oil will give the motor additional life and a safety net. Castrol EDGE EP 5W-30 is also a perfect choice, and it can even be run in light-duty types of diesel and fuel diluting Ford motors. The Mobil 1 EP has a $15 mail-in rebate per jug that you can fill out and collect online. You have a limit of two jugs/$30 per household. After rebate, you're looking at $20 for 10 quarts of high-quality motor oil. It cost Hyundai several billion dollars to learn that in some motors, they should use 5W-30 instead of 0/5W-20 because fuel dilution is so bad after 7500 miles that rod bearings seize and the connecting rods exit through the side of the block. The Theta II 2.4 in my 2018 Santa Fe Sport came with a 5W-20 oil filler cap. There is a TSB from Hyundai who clearly says not to use 5W-20, ever, only 5W-30. Even sites like Mobil1.com and Castrol.com, even Pennzoil.com recommend 5W-30 for my vehicle. This motor is a non-Turbo GDI and dilutes fuel like crazy. I don't go more than 5K miles on an OCI, and when I drain it, I can smell the nasty fuel mixed in there. One time I went 6K miles on a dealer synthetic blend, and the smell from draining the oil stayed with me for a few days. I couldn't shake it. It's not worth taking chances for a 0.05% fuel economy that she might never even get. I run 0W-20 in our Sonata, but one has an MPI/GDI dual injection naturally aspirated engine. The GDI doesn't kick in unless I'm in lean-burn mode cruising on the highway. Because of that, it's a very peppy car. A 2.5L MPI motor coupled to an 8-speed automatic can be very snappy