1996 gmc sierra water in oil

[doityoureself]

First off, v6 4.3 auto, had heads reworked, put back together and truck ran ran like a charm. But forgot to put antifreeze in as truck was in storage. So it busted radiator (and obviously other) now oil saturating with coolant very fast. Dipstick milky after running truck just 15 min and i would say a half gallon of water has transferred to oil in just 15 min with cap off radiador. I put on new radiator(to replace busted one), but it still mixes. Could it be head gaskets again? heads were just reworked with new gaskets. Do i have a cracked block? I would hope freeze plugs would prevent this. I am going to get another radiator to eliminate possibility of a bad oil cooler on rad.

 

[rdm1465]

based on what you said, I hope for your sake it isn't a cracked block. There are too many areas to check for coolant leaking into the oil. good luck

 

[Bill325]

You could have cracked heads, cracked block, or perhaps blown head gaskets. Hopefully, it's something more simple, like a leak from an intake manifold gasket. Does your engine have an engine oil cooler in the radiator, or is it an automatic transmission fluid cooler in the radiator ? "Freeze plugs" ( core plugs) have a poor record of protecting engine blocks from damage. If you're getting that much coolant into the oil pan, don't run the engine, or you'll damage the engine bearings pretty rapidly.