Question about 2005 Ford F 250 Super Duty

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6l diesel oil in coolant not coolant in oil

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  • pioneerhdd Nov 15, 2008

    Hi ****-40 i have determined that it is oil in the coolant. The coolant overflows and the oil is off the end of the dip stick. I think what i am going to do is first determine where the oil is coming from then remove the rad, heater core and any other removable part of the cooling system and take them to a rad shop and have them steam cleaned.

  • Ivan Strogan Jan 12, 2009

    Hey Guys I have the same problem with my 2005 F250 6.0l Diesel.

    the Engine oil is running into to the coolent system! The dipstick of engine oil is at very low! what should I do in this situation?

  • mike harris
    mike harris May 11, 2010

    Hi pioneerhdd, this oil in the radiator,have you determined if it is engine oil or transmission oil? The reason I ask is from 94-06 some vehicles equipped with 4.5L,6L or 7.3L diesel engines may develop oil in the cooling system due to an oil cooler failure, if the oil in your rad is due to cooler failure, once repairs are made be sure to flush the system, I would recommend motorcraft VC-1 coolant flush.Let me know how you make out, if it is engine oil in the cooling system I can provide you with the probable causes related to this good luck to you

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It does sound like an engine oil cooler failure. The cooler on this is the big lump of metal under the oil filter housing. It fits down into the block and has several hoses and sensors. The normal way to check for a leak is to pull it out and pressure test it. You may however be able to drain your coolant, then look for a short piece of hose between your oil cooler and EGR cooler. This hose will twist about 90Deg and then you can slide it back toward the EGR cooler. Make sure you have plenty of engine oil and start the engine with this hose off. If you have a bad enough oil leak the oil may be pumped out here. This may also be a craked head or a front cover problem, but most of the time those will put coolant in the oil.

Posted on Apr 19, 2009

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