Hyundai top end engine rebuild.

gwailodan · 2025-02-02T17:45:11+00:00

Since the mechanic said "I never saw that before", I figured I'd post a picture of a failed exhaust valve that led to an engine top-end rebuild. The vehicle is a 2018 2L turbo Hyundai Santa Fe. The mechanic figures carbon built up on the valve, then eventually melted through the valve. I had gotten oil changes every 8000-9000km at Hyundai. I'm told it should be every 5000 km, even with synthetic. Crazy maintenance requirement IMO!

Splitpair

codezer0 the turbo needs the oil to effectively spin those orders of Magnitude in rotational speed in order to build boost, and generate its advertised power.

Not true, turbocharger’s are spun by the engines exhaust gas, they need a constant supply of oil to keep the bearings lubed up and in some designs for cooling the bearings as well, in fact in some large diesel turbochargers, such as those used in locomotives have a backup electric oil pump that will continue to pump lubricating oil through the bearings for 10 minutes or more after the engine is shut down to keep the bearings cooled prevent the hot case of the turbocharger from boiling the oil out of the bearings, which upon the next startup could cause bearing damage.

Splitpair

Somewhat-Reticent Another possibility is fuel designed to burn carbon corroding metal next.
Such fuel can be “carbon-required”.

Na that damage was cause by a failure in the metal the valve was made of due to it not being able to handle the normal expansion and contraction exhaust valves are exposed to.

That valve was destined to fail when it was manufactured as a result of lousy engineering.

gwailodan

Splitpair I saw a videoa about “10 cars to avoid”

The guy said, “anything by Hyundai or Kia. I’ve seen all sorts of their engines explode”.

egeezer

Splitpair If you think you have a sludged up engine, just begin doing regular oils changes and clean it our gradually, not all at once.

… And don’t try to skimp on cost by not changing the filter. Most service shops automatically include a new filter, but some shade tree DYI types may not.

Somewhat-Reticent

egeezer For that matter, don’t skimp and go cheap on filter(s).

gwailodan

Somewhat-Reticent You can be somewhat outspoken. I don’t mind.

gwailodan

Splitpair The warranty in Canada was 5 years.

Dks01

gwailodan The guy said, “anything by Hyundai or Kia. I’ve seen all sorts of their engines explode”.

Anything with a turbocharger is problematic. I bought a 2023 Toyota Tacoma for that reason. The 23 has the 3.5l v6. The 2024 and on has a 2.4l turbocharged 4. Toyota has lots of experience with turbochargers, but I’ll wait for a few years before making a conclusion.

Somewhat-Reticent

Just recommending temptation avoidance. Not worth the risk.

digitalfutur

Direct fuel injected engines, if they don’t also have port fuel injection, are very unforgiving of lapses in oil changes, even more so if they’re turbocharged. This means using Tier 1 fuel and oil, and rigidly sticking to the maintenance schedule. It also means ensuring that the engine gets to full operating temperature, (oil temp, not coolant temp) every time it’s run, especially in cold weather. And not idling the engine more than it needs to be. All of these will help extend the time when carbon buildup removal is required, if at all.

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