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Oil Consumption - Replace your PCV Valve

stefan123stefan123 Member Posts: 3
edited March 2018 in Hyundai
I have seen many post detailing issues with Hyundai Sonata engines consuming oil. Mine was solved simply by replacing the PCV valve at 100,000 miles. Upon discovering it a full quart low after never experiencing any noticeable problem, I monitored the consumption carefully and measure an increasing and very alarming oil consumption rate in excess of 1 quart per every 1,000 miles. I spent money on engine flush products thinking it was sludge causing oil to blow past the rings. I finally decided to change the PCV valve and problem solved. My theory is that the valve spring exceeded its fatigue life and opened to easily causing oil vapors to be excessively expelled through the valve into the combustion chamber and out the exhaust. The valve is only supposed to open when engine pressure gets close to exceeding a value that could blow out seals and gaskets then closes. It also opens to expel any moisture vapors that build up in the oil
due to condensation. If it opens too easily oil vapors are constantly expelled. I'd like to know what others think.


  • KerriLynnKerriLynn Member Posts: 3
    2016 Tucson, and my huge oil consumption issues began at about 120K. I’m a traveling nurses aide, so I put a lot of miles on my vehicle. I can’t e en get to my oil change before having to add 2 quarts of oil. 
    Dealership just did $3400 worth of work on it, including PCV valve, fuel injection service, oil plug seal, plugs, catalytic converter. as the car began misfiring. STILL has oil consumption issue. A little stroll on google tells me Hyundai has a bit of an issue going on. 
    After my car receiving $3400 worth of work from the dealership, their service tech now states I need a new engine. Huh. Within 2 weeks of the work being done, now I need a new engine. Interesting. 
  • KerriLynnKerriLynn Member Posts: 3
    PS. My 2016 Tucson has 144k on it currently. Pretty sad if Hyundai engines start going to crap at 120k. 
  • KerriLynnKerriLynn Member Posts: 3
    And even more investigation seems to be showing me that other Hyundai model vehicles are having the exact same issues. 
    PS. Now the dealership tech is telling me the piston rings burn the inside of the engine, and it is a non repairable issue on these motors. 
    So, many of us have dying motors on our Hyundai vehicles. 
    I am so disappointed. I loved my Tucson....until this hit me. 
    Come on Hyundai, you need to do what is right. 
    I explained to the dealership tech that I’m not putting in a new engine with the very same fail rate as the one that’s already in it. What’s the point?? A new engine that I will MAYBE get 50k to 75k out of the motor before it has the very same issues my current one does. 
    Hyundai appears to have some HUGE issues with many of their models. Sad. 😟
    and to think, I’ll get to pay for another catalytic converter in about 30k, because the oil runs straight through the tailpipe. Bad news! 
  • ChewieBearStareChewieBearStare Member Posts: 2
    I found this thread after having to replace the PCV valve in my 2011 Sonata. We were 1,500 miles away from our next oil change, so you can imagine my surprise when my husband checked the oil and there was NO oil in it. It apparently burned off five quarts of oil in a very short period of time. The dealer said the PCV valve was bad, but the car only has 83,000 miles on it. Our service adviser wants us to check the oil weekly and come in to the dealer every 3,000 miles so they can log the oil consumption. If they deem it to be "excessive," they will contact Hyundai corporate and see about getting a replacement engine under the warranty.

    Fortunately, my car was included in the recall over the faulty production process/metal shavings issue, so the powertrain warranty was extended to 120K from 100K. I still have another 37,000 miles on it. Usually, you start having problems about 700 miles before the warranty ends, and they give you the runaround just long enough to allow the warranty to lapse. Not this time!
  • Cessna170BCessna170B Member Posts: 4

    I would like to add my experience to this.

    My 2011 Sonata (with dealership oil changes every 3,000 miles since new) suddenly began consuming oil at 67,000 miles.

    I replaced the PCV valve and the problem went away. I have had similar experiences with my Fords.

    When the PCV valve fails, it causes what is called blowby. Here, oil is routed into the combustion chamber where it is consumed.

    I have followed several forums where oil consumption problems begin around 70,000 miles. Many times, the oil loss is not discovered until the engine runs completely out of lubrication and is ruined.

    I spoke with a Hyundai engineer who said the company has no set policy as to when PCVs should be changed. I think they should establish such an interval.

    For me, I change mine every 30,000 miles just to be safe. The valve costs less than ten bucks and takes less than five minutes to replace with just pliers.

    Google "PCV replacement Hyundai Sonata" to find YouTube videos on the procedure.

    If any Hyundai leadership types are listening, establish a PCV change interval and you will see better customer satisfaction and fewer warranty issues.

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