Originally Posted By: Garak
Originally Posted By: Quattro Pete
Why does Castrol US even continue on with both grades? Doesn't the new(er) 0w-40 now meet all the specs that the 0w30 meets and more?
Try three grades, at least up here. The GC, 0w-40, and the 5w-40 on our shelves all meet the same specifications (with the API specs the only differences on a cursory check). Oddly enough, the new 0w-40 is about a buck a litre more than the GC or the 5w-40.
Out here, the 5w-40 version only meets MB 229.3, but the 0w30 and 0w-40 versions meet MB 229.5, so I consider them superior to the 5w-40 grade.