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I’ve read the gdi engines can get carbon or sludge build up over time. Is this true? How has the experience with high mileage gdi engines been in this forum?
 

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2011 Kia Optima
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To answer the questions, first I assume you're aware of the crappy designed engines installed in theses cars so maybe 10% will seize at some point in time regardless or the maintenance. Having said that, some do use CRC intake cleaner to keep intake vlaves from buildup, and some do install a catch can to keep the "oily" vapors from also getting to the intake valve.
Now, how necessary are these items, really don't know, but when I had the 2.0T engine replaced at 172,000 miles, never had a cleaning done, and never installed a catch can., the engine ran fine except for the qt of oil every 325 miles.

Really no definitive answer, but if one were leary of the buildup, the aforementntioned could be done, but would it save an engine from seizure, no.
 

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2020 Kia Soul X-Line 2.0 MPI
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My 19' Santa Fe 2.4 GDI runs excellent at 17.4k. But if I were car-shopping today and wanted a South Korean model, I'd shop their MPI engines-only.

I hate the sooty/carbon engines and our other South Korean model (Soul MPI engine) exhibits clean exhaust, not black smoke upon cold startup, like our 19' Santa Fe 2.4 does. It does run fantastic and the dipstick oil doesn't smell like fuel at 3.5k, which is the furthest mileage I will go on an OCI.

When shopping, I was smart enough to avoid the turbo engines. Just not GDI-smart at the time (October 2018).

Never-ever again. If someone were to steal our Santa Fe GDI tomorrow, I would not send a private search party out looking for it. If the police never recovered it, I'd be satisfied with an insurance company settlement.

I have plenty of money and could easily absorb a monetary (today's value) loss. Regret not buying the new RAV4 or CRV at the time, for around $3k more. Found a couple on the lot and neither had the turbo GDI engine
 

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Our 2011 EX 2.4 with over 60k on it gets great gas mileage and runs like a top. Uses no oil between 6000k changes
 

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2013 Ebony SXL Turbo: Original Everything @ about 189K with Drag wheels.
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Maybe they do buildup but I've not noticed any impact. I've got a '13 sxl (2L turbo) with almost 189k, burns little oil in 5K oci's, no smoke at any time and still gets 22.5/33 on regular top tier gas. It has never been cleaned internally so who knows what it looks like yet it runs like a bat out of heck!
 

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2018 Kia Optima
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Our 2011 EX 2.4 with over 60k on it gets great gas mileage and runs like a top. Uses no oil between 6000k changes
6000k between changes??? ;) How did you manage to get 6000k (miles) on a car that has only 60k (miles) on it? ;)
 

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Ok, Ok, it was a fat finger:rolleyes:.
So, to be precise :rolleyes:.......our Kia has 60k (aka 60,000) divided by 6k (aka 6,000) which is 10 oil changes ;).
 

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My 19' Santa Fe 2.4 GDI runs excellent at 17.4k. But if I were car-shopping today and wanted a South Korean model, I'd shop their MPI engines-only.

I hate the sooty/carbon engines and our other South Korean model (Soul MPI engine) exhibits clean exhaust, not black smoke upon cold startup, like our 19' Santa Fe 2.4 does. It does run fantastic and the dipstick oil doesn't smell like fuel at 3.5k, which is the furthest mileage I will go on an OCI.

When shopping, I was smart enough to avoid the turbo engines. Just not GDI-smart at the time (October 2018).

Never-ever again. If someone were to steal our Santa Fe GDI tomorrow, I would not send a private search party out looking for it. If the police never recovered it, I'd be satisfied with an insurance company settlement.

I have plenty of money and could easily absorb a monetary (today's value) loss. Regret not buying the new RAV4 or CRV at the time, for around $3k more. Found a couple on the lot and neither had the turbo GDI engine
Why do you avoid turbo engines?
 

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Regular service and oil change with top tier gas should avoid most problems. Of course there's always a possibility...luck of the draw. I put 200k on Hyundai w/ no problems at all. I bought another one.
 

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To answer the questions, first I assume you're aware of the crappy designed engines installed in theses cars so maybe 10% will seize at some point in time regardless or the maintenance. Having said that, some do use CRC intake cleaner to keep intake vlaves from buildup, and some do install a catch can to keep the "oily" vapors from also getting to the intake valve.
Now, how necessary are these items, really don't know, but when I had the 2.0T engine replaced at 172,000 miles, never had a cleaning done, and never installed a catch can., the engine ran fine except for the qt of oil every 325 miles.

Really no definitive answer, but if one were leary of the buildup, the aforementntioned could be done, but would it save an engine from seizure, no.
If they are such a crappy design why does Kia give a 100,000 mile guarantee? You got a good 172,000 miles?
 

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2017 KIA Optima
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Gotta keep up with those oil changes and do them more frequently if you drive that thing hard. Put in better quality oil should help as well. The Europeans started with the GDI engines and I've heard the horror stories on those. When I went over to KIA and saw that they recommend an additive each oil change, it gave me a peace of mind that these would go longer without the issues the Europeans were experiencing. My '17 Optima Hybrid gets top tier premium and synthetic oil, has 50k miles now and seems to be doing just fine.

I traded the Stinger for an Audi e-tron so no more oil changes, which will cut down on maintenance cost and charging mainly at home for daily commute, is much less than filling up the Stinger. The Hybrid does hold it own for range and need to fuel, making it a keeper. Just hoping all the extra love I give it will make it go longer without breaking the engine.
 

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If they are such a crappy design why does Kia give a 100,000 mile guarantee? You got a good 172,000 miles?
10/100 nothing but a sales gimmink and only for the OE, and how many engines die before 100k miles except the Hyundai/Kia 2.4/2.0T.
Yup 172k miles and engine replaced, but started using a gt p/1,000;miles at 108k miles and maybe 15% of the engines are replaced because of a crappy designed block. They are junk.
In all my years of driving, maybe 2 million miles, I've not had to replace an engine other than in the vehicles I've raced, and some of these DD cars had in excess of 250,000 miles. Our old '08 Optima 2.4 was sold in 2020 with 293,000 miles and never an engine problem, actually ran as new, big difference when compared to the junk direct injection engines.
Know 6 close friends that have the vehicles with these crappy engines and 4 have been replaced, 2-2.4 72,000 and 66,000 miles and 2-2.0T 76,000 and 172,000 miles, one 2.4 going strong at 80k miles, and the other, a 2013 2.4 with only 22k miles. That's 4 out of 6 replaced, what's that 67% replaced, a little above average.

Also that 2017 2.0 direct injection engine in the Hybrid is a different engine than that in the Optima.
 

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Is it the design of the engine itself, "crappy design block", or is the GDI method that you think is inferior to other fuel injection options?
 

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Is it the design of the engine itself, "crappy design block", or is the GDI method that you think is inferior to other fuel injection options?
Short block design, that's where the shavings originate, and my opinion is cylinder distortion, ring degradation that
eventually clogs the oil pump, then the engine seizes.
 

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I remember reading that KIA had problems with the sand moulding of the blocks. This caused oil not to get to all areas needed.
 
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