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Take into consideration that the oil filter, as it ages, increases its filtration capability.

I had the same engine; the oil consumption is due to the bad PCV Valve. I use Mobil 1 0W-40 with no issue apart from oil consumption

Generating yet another thick-vs-stupid thread

Point 1 makes sense; I use Amsoil for its unbeatable performance on long drains.

New Signature Series ?

I choose Amsoil because I travel.

If for you money is not a problem, go for Amsoil 0W-30 Signature Series, you will be more than ok at 10.000km Oil Change.

Go only with a good 5W30, Hyundai - Kia engines want thick beef.

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I see a lot of debate on this forum, thin vs thicker oil. I chose to go on thicker oil, first because Kia - Hyundai had big problems with thin oils in the past, I don't know now. Second, a basic concept that nobody seems to mention, the abrasive effect of particulate in the oil, thin oils...

You nailed it is just cafe valid only in North America. use 0W30 I do on my Honda Civic 1.5 Turbo.

On my Kia, I went 1 grade up the recommended on oil cap 5w-20. I put 5w-30 since Hyundai Kia engines struggle with 20.

First can be the PCV valve that doesn't release the pressure in the crankcase, so replace it. The second is oil grade too thin, with Kia, you need a thick beef. I have Kia too

Mobil 1 ESP 0W-30 is a relatively thin oil for 30W, with an HTHS of 3.0. It is the best choice. Mobil 1 5w30 HTHS 3.2 Mobil 1 euro HTHS 3.5

Use synthetic, and if you like longer drains. I suggest you use AMSOIL Signature Series. Which viscosity is recommended for that engine?

go for 0w-16

No, but it keeps the combustion chamber cleaner, and the deposit will be softer. Take into consideration that the turbo has a lower compression ratio, so there is no need for high octane; however, premium fuel has more combustion energy anyway.

Instead of premium gasoline, he can use regular gasoline with TCW3.

Kia and thin oils do not go together, at least 30W you need on that car.

Definitely is the best cleaner.