Question about 1998 Jeep Grand Cherokee

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98 jeep grand cherokee gas in oil

I have been having many problems with this thing. the new thing we have found is that the oil has gas in it, bad. i pulled the dip stick, wiped it on a paper towel and my lord it smelled like my gas tank. what could it be this time, and what do i need to do to put a for sale sign on it? it is an endless money pit!

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  • lori morris
    lori morris May 22, 2009

    I just did a full tune up on the car.Distributor cap, rotor, plugs, and wires, changed map sensor, oil change 100 miles ago.has a new computer, crank sensor,exhaust manifold, exhaust, battery, breaks, and tires. I'm so tired of putting money in this thing. I'm at about $3,000.00, and paid another $2,500.00 for it. So we can say $5,500.00. I just need to fix it, and sell it. Do you have any other suggestions? If I can't fix it I will just part it out, and hopefully get some of my money back. Thank you for all your time and help!!!



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You might have a spark plug that is not sparking.  Fuel will still be sprayed into the cylinder and not ignite.  It will then just drain into the crankcase past the rings.  I would pull all your plugs and check the plugs.  If you find one that is soaked in fuel, it's probably the one.

Posted on May 22, 2009

  • fplqnewc
    fplqnewc May 23, 2009

    I definitely understand your frustration, I've had a "money pit" vehicle before (my blue Ford Aerostar). Everytime I fixed one problem, another one would pop up and I have been burned too many times by mechanics and dealerships. Back to your problem of gas in the oil. The only interface between the fuel system and the lubrication system are the piston rings and valve seats.


    That's is why I thought you should look at your spark plugs to confirm that they are getting spark (ie they are not wet). I know you have put a lot of money in the vehicle already and want the nightmare to end, but you might do good to just press through as this might be the last problem you face. :).


    Have a compression check done on each cylinder. A low compression cylinder might indicate a defective ring allowing fuel to get into the oil. Because your vehicle is 10years old, your compression overall will be lower than a new vehicle, but one cylinder that is lower than the rest will indicate a "bad actor". I look forward to hearing from you.

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