New to F-series trucks but not to Ford. Picked up a 75 F250 with what is believed to be a 360 v8. Now... for some reason there is oil in the radiator leading to the dreaded chocolate milkshake effect. The color is brown and not red (transmission related strawberry milkshake). Analysis to date: Trans fluid is clean and indicates no water contamination. Oil pan is clean and indicates no water contamination. Spark plugs are clean indicating no water contamination. No water or steam from exhaust at startup or during heavy driving. Truck runs great, cool and engine is strong. Flushed radiator several times however oil contamination continues to persist. Curious if this is head gasket related/water passage related/design related with an easy fix or something else. Note: I am not an expert on old iron block ford V8's but am dedicated to preserving these great old trucks. Any thoughts, analysis, hypothesis or dirty jokes welcome. Thanks in advance.

 

The oil has to be coming from someplace.
Does the engine oil level show any loss?

 

Hi. When I changed the oil it was very low so agree that there is consumption getting into the water. I am monitoring the oil now but am still perplexed as to where and how it it weeping into the coolant system. Just found this as well for 360 FE engines https://www.ford-trucks.com/forums/1...n-coolant.html Might the likely culprit

 

Something to keep in mind,
Oil pressure can go as high as 50 lbs,where cooling system press will rarely exceed 15 lbs.. Questionable gasketing can allow the oil a path into the cooling syst.