Is this is a good deal
http://goo.gl/Jt8Gdp??
Castrol 06244 EDGE 0W-30 SPT Full Synthetic Motor Oil - 1 Quart Bottle, (Pack of 6) for $45.
The BMW manual says 5w-30 so I am confused, but the review on Amazon and this forum suggest this is a good oil. Just need confirmation.