99 7.3L oil in water

[tkeel]

i have a 99 7.3L 3/4 ton super duty with 210,000 and i started getting oil in the overflow reservior and it has a slight vibration when its cold. No water in oil either. got any suggestions?

[Dietoremain]

are you sure its oil? not diesel fuel?

[kanuck15]

oil cooler o rings

[powerstroke bates]

oil cooler o rings mine went bad @200,000

[444 ci]

oil cooler its the only way to get oil in your coolant

[tkeel]

Originally Posted by Dietoremain

are you sure its oil? not diesel fuel?

positive! Its black and merky like oil.

[dieseldan2005]

X3 on oil cooler o rings. Make sure you flush out the cooling system a few times with dawn dish soap to clean out that oil.

[tkeel]

Originally Posted by dieseldan2005

X3 on oil cooler o rings. Make sure you flush out the cooling system a few times with dawn dish soap to clean out that oil.

What is x3 o-rings? I had a ford diesel tech tell me to use simple green cuz you don't want something that suds real bad

[dieseldan2005]

I meant that times 3, the other guys that had said oil cooler o rings. On the soap note, the dawn is what i have heard to use, simple green should work well too. You could also try cascade too. I just did some looking around and the cascade seems to foam way less.

[shaun7569]

I have been fighting this problem for months. We have replaced every external part that could possible cause the problem (oil cooler, timing cover gasket, etc.) finally the other day as I was going down the road the engine temp spiked. went from normal operating temp to pegged in about a minute. any thoughts