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overheating

Engine

Model: 911S, Year:1976, Mileage:108m, Type of use:Street use only
Back to overheating again in my 76 911s. Recently, a mechanic friend of mine suggested changing my Castrol 10w 30w standard oil to a newer synthetic type of oil that could reduce operating temperatures as much as 15 to 20 degrees in hotter driving conditions. (refer to my previous questions on this subject) Is this a valid opinion ?

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