This seems to be the lost forgotten oil, since nobody here really mentions it, and honestly I don't think it's an oil of much use to too many people. Is anyone using it and planning an oil analysis? A guy in my car club works for Imperial Oil, and he keeps trying to tell me that Mobil 1 0w30 is better for high performance than 5w30 and 10w30! One of his points was that it was thicker at 100c, although it's so close I can't see the difference (0w30 is 10.1, 5w30 and 10w30 are 9.7 and 9.8) I keep trying to tell him that the 0w30 contains more VII and even if it's slightly thicker now, it'll quickly thin out to a 0w20. I believe he works more in the accounting side of things, not the technical side, so his comments are probably more of a hunch than any factual info he has. But I'd still be interested in hearing your thoughts on this. I've never heard any mention on here that the 0w30 uses any better base stock than the 5w30 and 10w30, so to me it seems like a bad choice for hard driven cars.