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1985 911 Carrera Castrol Syntec 5w50

Engine

Vehicle Information: Model: 911 Carrera Targa; Year: 1985; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 77,300;

The shop who maintained the car for the previous owner used Valvoline all climate 20w50 motoroil. I am planning to switch to Synthetic since the climate in Houston is very hot (upper 90's in the summer)I am not sure whether Mobil 1 or Castrol Syntec 5w50 would be the best, also I have heard that switching to Synthetic might induce seal leaks, is that really the case?

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