Wtf causes this to happen‽‽‽

This is a severely blown out head gasket or filled with grease instead of coolant.:lol:
 
Assuming it is not fake, transmission cooler leaking oil into the radiator.

Dave
 
I've never, in 61 years, seen anything that could cause that......Oil in the coolant is one thing but that is insane. I have heard of people adding oil to the radiator by mistake but would that be enough to cause that kind of mess??!
 
20 years in the Army around tanks, trucks and artillery and I have never seen anything like that. Not even Russian F. U. stuff.
 
It's too clean to be oil, engine or tranny since it would be more like chocolate milk. As mentioned I bet it was stagged with a black bearing grease into the top of the radiator....run vehicle unitl it builds pressure, then pop cap for cool grease discharge and then sit back and wait for the ching ching of those oh so valuable internet points and upvotes.
 
My 83 RZ350 had a water pump driven off the crank with a double lipped seal between on it's shaft that separated antifreeze and trans fluid. The red gear oil and red antifreeze made a strawberry milkshake version of that. Horrible **** to rinse out. No temp gauge hooked up but caught it before overheating issues.
 
My 83 RZ350 had a water pump driven off the crank with a double lipped seal between on it's shaft that separated antifreeze and trans fluid. The red gear oil and red antifreeze made a strawberry milkshake version of that. Horrible **** to rinse out. No temp gauge hooked up but caught it before overheating issues.
You still got your RZ? I had a Kenny Roberts version for a short time. Really liked it!! Sold it to a young lady who could ride the wheels off of it!! That was 25 years ago, she's got 3 kids and a Moto Guzzi now!
 
You still got your RZ? I had a Kenny Roberts version for a short time. Really liked it!! Sold it to a young lady who could ride the wheels off of it!! That was 25 years ago, she's got 3 kids and a Moto Guzzi now!
You still got your RZ? I had a Kenny Roberts version for a short time. Really liked it!! Sold it to a young lady who could ride the wheels off of it!! That was 25 years ago, she's got 3 kids and a Moto Guzzi now!
Bought it new in 83 and had it in the famiy till mid 90s as my stepson ended up with it. Still know where it is now actually. Loved that lil rocket. Have an 89 FZR 400 with a 95 600 engine in it.

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