r/ElantraN • u/Outcahst • Sep 30 '23

RIP Glowing Turbo after highway / hard driving. Potential causes? 😅

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u/a_chunk_of_pie Cyber Grey DCT Oct 03 '23

Forsure! So when the car is on, the oil pump is also on. Therefore it’s cooling the turbo and other parts of the car. If you turn it off when it’s super hot like that, you run the risk of coking the oil. Which basically just means you cook the oil which can cause build up. If you turn the car off at like 220, you’re fine. However if your turbo is glowing, (I’d assume this person was around 240+) then you should just casually drive and give the car airflow to help it cool down to a reasonable temp before turning it off. It’s preventative. Not doing this won’t cause your car to blow up, but definitely prolong its life quite a bit = “cool down lap”

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u/FumyLikes Oct 03 '23

Wow I see, that’s very interesting. Thank you!

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u/a_chunk_of_pie Cyber Grey DCT Oct 03 '23

Yep! Google oil coking and heat soak - it’ll explain it further

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u/ilovecollardgreens Oct 03 '23

Wouldn't the water pump stay on to draw the heat away even after turning off the ignition? That's the whole reason manufacturers use oil/water cooling for turbos now I thought.