Try a 10w 40 weight.
If you live is a hotter climate use a 20 w 50.
The old addage about "once you use synthetic oil you have to for the life of the car" isn't true.
You just can't mix the two types of oil.
Good luck,Gary
Congradulations on your purchase!
From pages 5-15 and 5-16 of the 2006 Pontiac Torrent owner's manual:
Above -20 degee F (-29 degree C) use SAE 5W-30 multiweight oil that meets GM Standard GM6094M. At or below -20 degee F (-29 degree C) use 5W-30 synthetic oil or SAE 0W-30.
Here is a link a pdf file of the American English version of the owner's manual:http://www.manualowl.com/a/Pontiac/2006-...
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