I had switched to Castrol Synthetic from Mobil one when they lost their ratings about five years ago but they have been re-rated so I have switched back to Mobile one 5W-40 but I would also use 0W-40 in cold winter weather.
Here is the most definitive discussion of oil I have read. Check it out
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
Last edited by landrovered; 10-11-2011 at 12:16 PM.
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