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Hello everyone I’ve got a 93 superduty that I’m having a problem with.It started getting oil in the coolant so I changed the O-Rings in oil cooler. Now I’m getting coolant In the oil pulled all the glow plugs out and backed off all rocker arm bolts done the air test everything checked out I know something is wrong because it loses coolant fast out of radiator I’ve also pressure checked the oil cooler and it is good I’m at a loss with this truck any way any help is grateful
 

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Could be a cracked head or bad head gasket, especially if it was overheated. Another more rare possibility is cylinder wall erosion if a coolant didn't have SCA's for diesel engines.
 
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