Question about 2002 Nissan Altima

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2.5s altima buring oil

I have a 02 nissan altima 2.5s. that is burning oil from the exhaust and i have to add coolant once and awhile. i change the spark plugs recently and they where black as night all covered in a oily black residue. i took the car to a shop and they did a compression test and all cylinders were reading over 180lbs. which i was told that this was normal for this car. what do you think is wrong with it thanks.

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  • mgyantiii May 31, 2009

    so you dont feel like it is the head gasket or a problem with the vavle seals

  • mgyantiii Jun 01, 2009

    i did a pressure test on the coolant system and saw that there is coolant sitting inside the #2 spark plug cylinder and a little on #3. what do youi think.



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Change the piston rings sets of each piston and if the vehicle has been running for 5 yrs or crossed 50,000 miles then u might need to to replace with 1-oversize rings, filed properly by the mechanic.......................sodeep

Posted on May 31, 2009

  • Sudeep Chatterjee
    Sudeep Chatterjee Jun 01, 2009

    Yes, first check out how much mileage the car has run & my instinct has guided my advice. If it has not run as long as mentioned then you might try the head gasket or oil seal change...................sodeep

  • Sudeep Chatterjee
    Sudeep Chatterjee Jun 02, 2009

    That's for the coolant. As u have mentioned coolant is leaking in 2 cylinders & the only way of plugging that leak is re-boring of the cylinders. If that has been diagnosed, then this is a major repair job involving removal of the engine block. Check the cost effectiveness of such a repair job..................sodeep


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If its consuming coolant, most likely it's also burning oil, replace engine, and possible catalyst is also no good.

Posted on Jul 25, 2012

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I also have the same problem took the head off to find nothing wrong with the head nor gasket. I was told by my friend that the catalytic converter may be the problem. Back pressure builds up and pvc valve sucks up the oil. Check your catalytic first.

Posted on Feb 16, 2010

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Autozone will do free scan test for fault codes by the way.
PCV won't show up there though.
You can buy cheap engine on ebay or at page with asterisk is lowest price.

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i found out the cat bein broken up and suckin into the fudgin pinstons....good luck everyone

Apr 14, 2009 | 2002 Nissan Altima

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CODE P0420

Check for any exhaust leaks, hopefully your not burning oil, or losing coolant, and have exhaust checked for possible plugged catalytic converter.

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