The performance requirement for a 0W rating can be exceeded of course. Unlike the other ratings there is no requirement to label the oil with the better performance category since there is no better category. You have to rely on the blender’s word for this. If HPL says it is better then what is required then I’m sure it is. They are all the same in that they meet the requirement for labeling.
And yes a full synthetic oil most likely meets the performance requirements for a better winter rating easier than does a blend. But as a blanket statement that’s very vague.
And yes a full synthetic oil most likely meets the performance requirements for a better winter rating easier than does a blend. But as a blanket statement that’s very vague.