Hope someone can help me on this problem. About a year and a half ago, I lost coolant with a hose on the oil cooler near the oil filter. Anyway the engine got overheated and I did not see the temp gage right away. They ended up taking 8 thousands off the head. A while later, not sure of time at this point. I started getting oil in the expansion tank. I did use die to find out it was not transmission fluid. I have sent all the fluids through to have tested. I have flushed the cooling system several times. Cleaned the expansion tank alot. Thinking that it was just oil left over from the blown head gasket. I have tested the turbo with R-22 pressure, 125 to maybe 150psi and no leaks. Let it settle with temp and pressure and had no loss. Did the same with the oil cooler down by the oil filter. That was last summer. Just the last week, had a mech. do the diaghram in the turbo. He said it was falling appart. He also did a boost test. I have called a turbo shop here in Des Moines, Ia. They do not think it could be the turbo. It would have to be a casting crack. I called a machine shop that redoes heads. If I have a oil port maybe cracked. Plenty of power, Just a small amount of oil in the expansion tank. The machine shop thought it could be a oil cooler down by the oil filter. He has heard of a few of those going bad. Can anyone give me an idea of which way to head to find out if this oil is coming from the turbo or head or the oil filter. Just looking for some suggestions. Note, I just had to retire my 245 with close to 400,000. This 940 had the turbo rebuild about 3 years ago with new bearing etc

Though I have never seen it, I too have heard of the oil cooler separating inside. I'd most likely start there. Hope this helps.

Chris

Chrissij
Thanks for the input. I hope to get more details. Do you know if it is much of a job to pull this oil cooler off. It seems, whatever I do it is big bucks so I am trying to save where ever I can.

Thanks
Roy H

I thought the oil cooler was completely separate from the cooling system- it's a tiny radiator tucked in between the intercooler and the AC condenser. I admit that I never pulled one on a 93, but did on a 91. Think it's the same but I'm always willing to be corrected.
I can't see how the systems would mix besides at the head gasket unfortunately.
Given the car's history, I think it must be opening up something either on startup or cool-down.
If it were ATF, and I've seen that several times, the trans dipstick would show something looking like a chocolate milkshake. AND you'd be needing a transmission next week, as well as a radiator. Seen that a few times, and it's not good.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K