1993 Trans Sport 3.8L Oil in Anti Freeze

[tinkering]

The van and motor have approximately 400,000 km on them. I went out yesterday and removed the rad cap, and low and behold there is a layer of chocolate milk on the top of the AF. I am quite certain we have oil in the rad, so that could mean intake or head gaskets leaking.
I have no idea how long that problem has been developing. I had a leaky heater core for quite some time; I used some stop leak then. When I replaced the heater core I don't remember the oil in the AF.
I wonder if it's worth trying stop leak now to seal up the oil transfer? Would I use engine oil sealer, or coolant system sealer?
Has anybody changed head or intake gaskets on a 3.8L? How tough of a job is it being tucked away in the engine bay like that?

 

[tinkering]

Can you pull the lifters without removing the heads on a 3.8L GM engine?
There is a tool, a small slide hammer that will reach through the push rod holes and pull the lifters out of the block. I wonder if it will work on a GM 3.8L engine?

 

[melsg5]

Are you sure it's not automatic transmission fluid?
Do you have the milky brown substance in the oil fill cap?

 

[tinkering]

Are you sure it's not automatic transmission fluid?
Do you have the milky brown substance in the oil fill cap?

That is what I was thinking but I didn't think of checking the oil filler cap.
If it is ATF I will continue working on the van. If it is head gaskets I might not do it. I am running out of energy

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[tinkering]

Are you sure it's not automatic transmission fluid?
Do you have the milky brown substance in the oil fill cap?

Zero milky brown substance on the oil filler cap, or the oil dipstick, and nothing on the tyranny dipstick.

 

[melsg5]

Zero milky brown substance on the oil filler cap, or the oil dipstick, and nothing on the tyranny dipstick.

You won't see it on transmission dipstick. Line pressure in transmission is much higher than coolant temperature.

 

[tinkering]

You won't see it on transmission dipstick. Line pressure in transmission is much higher than coolant temperature.

Ahha. Right on. Thanks

 

[G-820308]

Ahha. Right on. Thanks

Same thing happened to mine you need a radiator the radiator is broken between the antifreeze and the transloading and they're mixing together making the radiator chocolate Milky

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[tinkering]

Excellent!
I'll grab a chiny rad, and away we go. Lots of things to repair on it now but have to work my way over there again.
Thanks for gettin back.