The oil will naturally try to float up, so the majority will be in the top of the radiator.
Add some dish soap to the radiator a day or so before, let it run and work on the grease.
Start it up, get it warmed up to operating temp with the cap off. Hang a very slow running hose (hot water if available) in the open radiator. Try to float as much up and out as possible. If there is still oil collecting, repeat a few times until the majority is gone.
Then drain and flush with the engine running at fast speed, the drain open, and the hose running fast enough to keep water coming out the top of the radiator. To get the best flush, temporarily remove the thermostat.
Let it drain. There is a block drain, if the plug will come out. You'll probably have to prod the sediment out to get it to drain. But if it won't come out, don't risk twisting the plug off.
Once drained and flushed, might give it a few days to see if any more oil comes up, and it probably will. Repeat until yu are satisfied it is clean. Then drain the water and refill with 50/50 antifreze and distilled water or premix.
Take a look at the hoses and radiator cap. They may need replacing as oil will attack them from the inside.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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