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Call the dealer where you bought the car. I'm guessing 0W40 because that is what Porsche mandated for all the dealerships to use in the Porsches coming in for service.
It's always best to use whatever is in being used in the car today unless it is an emergency. Don't guess though. Just make one phone call and you'll know for sure.
If it is 0W40, good luck finding it anywhere outside of a stealership...I can't get it anywhere else. That's why I'm going to change to 5W40 next time around... just to have it available at $3 a quart cheaper than the stealership's parts counter.
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