Oil in coolant, but oil is clean?

[Trogdor88]

Hey guys, long story short i tried to fix my overheating issues and broke everything.
So i got a new radiator, and while dumping the old one out the radiator cap had some oily sludge on the bottom of it, a little bit in hoses and around the top, inside of the radiator where the cap sits. Not a heap, but it feels like greasy old oil. But my oil in the engine is fine, no milky, no froth, needs an oil change as its getting old but otherwise looks normal. What could be the cause of this? Id assumed if i had a cracked head there would either be more oil, or coolant in the oil too. Attached a pic of the coolant, its full of crap because the container i poured it in was dirty but theres been no oil settling/pooling on top of it or anything.

 

[Trogdor88]

Forgot to mention, 95 HZJ80.

 

[Malleus]

It's the color.

 

[ERG80]

How long have you been running green coolant in it and what coolant was in it before? There are a lot of threads here about sludge forming from mixing incompatible coolant. Might be the cause of the oily looking sludge.

 

[Trogdor88]

How long have you been running green coolant in it and what coolant was in it before? There are a lot of threads here about sludge forming from mixing incompatible coolant. Might be the cause of the oily looking sludge.

Been running green since i got it, over 10 years now, as that was already in it. Id always planned to go back to red and just never got around to it, now that im having to replace half the cooling system i figured id do it now.

 

[petegangies]

Been running green since i got it, over 10 years now, as that was already in it. Id always planned to go back to red and just never got around to it, now that im having to replace half the cooling system i figured id do it now.

flush it extremely well... and when you think you've flushed it enough, flush it some more. Flush every orifice haha!

 

[Broski]

There’s nothing wrong with the green coolant especially if you been running it for ten years.

I would suspect maybe the oil cooler is leaking.

 

[60 toy ota]

Oil cooler or head are the only possibilities. 4 runners can be known to have "strawberry milkshake" from internal radiator leaks, but I'm assuming your hzj isn't an auto.

Keep in mind your oil pressure is north of 60 psi and your coolant probably never sees 17 psi. Makes sense you don't have coolant in the oil

 

[Trogdor88]

Bleeding air out while running another lot of demineralised water through to clean all the remaining green out of the system, and ended up with this in the filler while burping the air out.

 

[Trogdor88]

Oil cooler or head are the only possibilities. 4 runners can be known to have "strawberry milkshake" from internal radiator leaks, but I'm assuming your hzj is an auto.

Keep in mind your oil pressure is north of 60 psi and your coolant probably never sees 17 psi. Makes sense you don't have coolant in the oil

Not an auto, manual mate.

 

[60 toy ota]

Not an auto, manual mate.

Oops, meant to say *isn't an auto