Hi guys, I'm looking for oil for my new to us Pontiac Vibe base model. I was in the GM dealer recently and noticed they have Ac Delco oil synethic blend for 3.99 a litre. This is about as good a deal as youll find on regular priced oil. I think it's what it's the car right now because of it's recent GM oil change. Any reason not to run this in a nasty cold Alberta winter? The other options price wise are Motomaster synthetic, Motorcraft syn blend at the Ford dealer, and Petro Canada oils from the gas station. Other oil usually go on sale at the local Canadian tire, but there are regulars. The car has 100k miles and the oil will be changed at 6 months 3-5k most likely. Any thoughts?