The reason Porsche added the line from the top of the cooler to the surge tank in the trunk is that the oil cooler is the highest point in the cooling system, and tended to collect any air bubbles in the system, reducing the cooler's efficiency. Adding the line prevented that from happening.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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