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I'm not sure what vehicle we are speaking of, but it is most likely not oil in the radiator. It is transmission fluid. Your radiator has two separate areas designed to cool the engine coolant and also the trans fluid. What most likely happened is these two areas developed a crack, and is allowing the trans fluid to enter the radiator. Replacing the radiator will correct this issue. In most cases, your trans fluid will also be contaminated with engine coolant, and the trans fluid will also have to be drained and flushed.
That's not good.
The best advice I can give you is drain the transmission fluid and remove the tranny filter(requires removal of transmission pan), flush several quarts of tranny fluid through with the pan removed to grab any residual oil,replace tranny filter with a new one, reinstall pan, re-fill tranny pan with proper oil and add a whole bottle of "Lucas Transmission Stabilizer". The stabilzer works wonders with the slipping, although if you keep driving it the way it is now you will at worst "grenade" your tranny, if you take the steps above you could still get a lot of life out of it provided no serious damage has already been done. Seek a mechanic if you are not familar with the disassembly mentioned above.