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I own outright a 2013 Hyundai Elantra GT, 1.8Lnu port injected 4 cyclinder w/ 78k miles. The oil has always been changed every 3500-3700 miles either by a Hyundai dealer, private shop, or myself. I'm unable to provide proof of every change but if anyone were to pull the valve cover or oil pan, it would be clean and sludge free. I have a 10 yr/100k factory warranty.

I cannot tell you exactly how long ago I noticed this loud noise, which is more pronounced when the engine is cold. This engine has always been "chatty", which I contributed to valve train noise and the thin oil it's spec'd for. There is a distinct knock noise that I believe started around 60k miles. Car runs great and has been problem free. I consider myself a spirited driver, and frequently take advantage of all 6 speeds.

Dealer told me over the phone that piston slap isn't common and they will diagnosis it for $125. A quick google search infomed me that a TSB was issued for Canadian cars within my model year, and same engine, and short blocks were to be replaced on Hyundai's dime. The Elantra GT was all built in the same factory. This TSB wasn't issued in the US, and it appears that people have fought/class action lawsuit to address this very same issue.

Below is a video of my car, running when cold. I hear two distinct sounds- a knock (louder, more solid sounding), and valve chatter (higher pitched chatter).

Thoughts??? Advice?

 

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If it changes with rpm or load (almost goes silent) it's most likely rod knock.
What oil and what climate are you?
 

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The fact that it is more pronounced when cold tells me piston slap. doesn't sound like a rod knock to me. Take it in, show them the Canadian TSB, plead your case about cars being made in same place (GT's were Korean, Sedans were mostly Alabama), and go from there. at least get it on record.
 

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Sounds exactly like my car when it had low mileage. I am running 5w 30 synthetic now & don't have much noise. I'd advise against using 5w 20.

My car has 100k kms now.
 

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Any "knock" should be gone in a few seconds on a cold start...then there's the mechanical HPFP that they attempt to sound deaden!
 

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I own outright a 2013 Hyundai Elantra GT, 1.8Lnu port injected 4 cyclinder w/ 78k miles. The oil has always been changed every 3500-3700 miles either by a Hyundai dealer, private shop, or myself. I'm unable to provide proof of every change but if anyone were to pull the valve cover or oil pan, it would be clean and sludge free. I have a 10 yr/100k factory warranty.

I cannot tell you exactly how long ago I noticed this loud noise, which is more pronounced when the engine is cold. This engine has always been "chatty", which I contributed to valve train noise and the thin oil it's spec'd for. There is a distinct knock noise that I believe started around 60k miles. Car runs great and has been problem free. I consider myself a spirited driver, and frequently take advantage of all 6 speeds.

Dealer told me over the phone that piston slap isn't common and they will diagnosis it for $125. A quick google search infomed me that a TSB was issued for Canadian cars within my model year, and same engine, and short blocks were to be replaced on Hyundai's dime. The Elantra GT was all built in the same factory. This TSB wasn't issued in the US, and it appears that people have fought/class action lawsuit to address this very same issue.

Below is a video of my car, running when cold. I hear two distinct sounds- a knock (louder, more solid sounding), and valve chatter (higher pitched chatter).

Thoughts??? Advice?

My 2011 Elantra GLS A/T sounds just like your "chatty" one. Mine has a few more miles on it(394K), but still gives me great performance and mileage. I have been using Mobil1 full synthetic(5W-30) and KN oil filter since purchased in '13 with 42K miles on it. Usually do oil and filter around 10K. The noise is more pronounced on cold start-up and quiets down when warmed up. Still there, just not so much.
I've been using mine as courier vehicle(part time retirement job) usually part interstate/city mixed driving(75/25% mix). Most repairs have been the usual stuff that wears out with heavy usage. Other than that, I'm satisfied with the car. Just had a tire sensor die and really don't want to replace it. Gotta figure that one out.
If you're happy with the car, stay with it.
 
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