Question about 2004 Hyundai XG350

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Car was jerky and I changed the transmission fluid that solved the problem, but where the engine was running fine and I changed the oil and put in new spark plugs the valves are now tapping loudly. I don't understand this. What do I need to do now about the tapping?

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Because the oil in the engine was old it was thicker than the new hence the top end tapping,a car of this age should have 10/40 or even 20/50 oil in it.dependant on oilburn.....

Posted on Aug 26, 2010

Testimonial: "Thanks I believe it because the oil was thick and slow to run out. I will drain again and put thicker oil in thanks! RT"

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I just looked in a owners manual for this vehicle and on page 6 you can see under specifications what oil types to use. 5W-30 is recommended weight and viscosity for this vehicle. 10/40 or 20/50 would generally be to heavy of oil and may cause damage to the motor. Best if you go with factory specifications on oil. Cause if you think your old oil was thick and slow to run out that will be worst. Thicker oil doesnt mean better unless you live in a desert. in which case id use 10w30. But for all purposes stick with the 5w30

Posted on Aug 26, 2010

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  • geoff hunter Aug 26, 2010

    whilst i would agree with you with a NEW car, as a car gets older it burns more oil,(modern cars are designed to burn oil (ASK AUDI/MERC/BMW.)and WILL burn about a pint every 1000m.VW state" 1 litre EVERY 250 is ACCEPTABLE"
    so my reccomendation to use a thicker oil is valid.and as you know its the lower sae # that counts, on cold starts.(the higher sae # is only reached in a hot engine)so oil burn IS reduced.
    and on NO account will using a "thicker oil"cause any damage.....50years of experience

  • Nathan Ayers
    Nathan Ayers Aug 26, 2010

    i can tell your level of experience from some things you post but it seems you tell every person to use 10/40 and 20/50 when most cars its not applicable. If what you say the highest you would go is 10/30 And yes it can cause damage to motors. I dont know where your under the pressumption that it cant. It causes parts to move slower and creates sludge that modern oil pumps cant handle. maybe 20 years ago in v8's you could use thick oil under certian conditions. It can even make the rear seal blow which is the same as over filling the motor with oil. 20w50 is insane to put in a car like this.

  • Nathan Ayers
    Nathan Ayers Aug 26, 2010

    for proof read here http://www.popularmechanics.com/cars/how...
    and herehttp://www.valvoline.com/car-care/motor-...
    "it is generally recommended to always stick with the viscosity recommended" Not go with something like 20w50 which is 2.5X thicker then the recommended oil. These people have to live with there cars and dont need to cause damage to the motor by using the wrong oil. I am only here to help people and make sure they get the proper information.

  • geoff hunter Aug 27, 2010

    Hyundai dealers in EUROPE buy thier oil from Hyundai EUROPE and it is all 10/40 OR 20/50 SEMI SYNTHETIC.and in the handbooks for the cars supplied,shows both can be used as described by me in my posts.
    that is not to say i disagre with what you are saying,a thinner oil is preferable in a new car so that oil circulates quicker on cold mornings etc.but as the engine gets older.........the only statement i should have said is that the oil/filter should be changed at 15k or annually dependant on usage etc.for the obvious reasons....perhaps makers should train all their technitions at the factories,would be nice to have a holiday in china where Hyundai make most of the xg range.

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