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overheating

Engine

Model: 911S, Year:1976, Mileage:108ooo, Type of use:Street use only
Twice now I have oil overflowing after turning the car off on hot days. I stopped to drop off a friend and spent enough time to allow the engine to cool a bit then checked the oil and it was fine. Then took the 22 mile trip home about 1500 ft. higher up with the air conditioning on using Castrol 10W #30W oil, pulled into the garage and went upstairs. My son arrived about 30 minutes later and said the garage was full of smoke. Each time I had about a pint of oil on the garage floor. Should I be using an additive or a heavier oil ?

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