Often in the plastic radiator endcap there is a oil cooler tube, I think its just auto transmission cars that have them. (Jap cars?)
Its a brass tube, double walled 10-12 inches long, the ends have a threaded fitting/ hose connection that pokes thru the plastic endcap.
I have never seen a reference to them here, but if you have a lot of radiators, they will show up enough times for you to make extra money from them.
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Posted later on.
I didn't know I had a pic of them till I looked, this is two of them, to scale. >
I had a idea of using them to heat water in the wild, using a really small gas flame.
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