Oil recomendations

[BobbyBBB]

Which Mobil 1 Supersyn oil is better for our cars for not under -10ºC?

0W-40

5W-40

5W-50 (new and aproved for the SLR McLaren)

All are aproved by Porsche.

[Loren]

From the Porsche TSB on "Approved Oils"

Engine oils in SAE category 5W-40 or 5W-50 can be used at temperatures down to -25°C (-13°F). Oils of viscosity class 0W-40 can be used at lower temperatures as well.

[BobbyBBB]

Many thanks Loren. You are the Porsche's Bible.

[able2ski]

I'm buying Mobil 1 @ Walmart. All I've currently seen on the shelf is 5W-35, so thats what I've bought.

Considering the cold weather (even here in NC), I assumed I'm OK as long as I swap to a higher viscosity come consistently warmer weather.

Would you feel the "35" rating is too thin even considering the current temps remain 30-50 degrees F?