The BMW is an air cooled engine. An oil cooler will aid to keep the engine at more even temp and does cut down the peak temps.
When the oil gets too hot is breaks down (faster).
Still... the more parts that can cause trouble,... the moretrouble will ensue -  -
Of cause it is worth installing an oil-cooler!
Do you ever ride in trafffic jam ?...
Ever got stuck in traffic ?...
Get the cooler!
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Drive Safely,
Albert
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