The reason I used one in the past was because I built a car with a rear water radiator, so that I could mimimise the air entry under the bonnet and air flow under the car. It was a Laminova next to the engine, or exstensive oil hose to the back and return.
The oil-to-water cooler was about right; the rear rad worked, except at full race speed, when it always boiled over. I think the problem was relative levels of engine and rad, and air trapped in the hose between them.
Oil-to-water cooler? Only if you can't/won't get air to a front air radiator oil cooler.
John
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