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The link Plumb Bob posted said that oil MUST be marketed as the lowest grade it meets. So in theory, any 0w should be thinner at -35 than any 5w. (That's my understanding. Thoughts?) But, I haven't yet seen if there is any way to compare them at the same temp. IE its -20 here tonight, are the...

Okay. I get it now. The winter grade isnt a set temperature, but rather a maximum thickness at each temp level. That makes more sense. So simply the 5w30 isnt below 6,200@-35 and therefore must be a 5w. It definitely makes sense now. I was just trying to see how much thicker the 5w30 i use...

Is that done so its difficult to compare? Seems silly to test one at -35 and one at -30.. both are tested hot at 100c..

Hey all. Im new here, long story short, I was looking at reducing the amount of oils I buy, and was looking at the difference between the 5w30 and 0w20 that I use. Am I missing something, or is the 5w30 CCS viscosity not lower than the 0w20? Why is that? Thanks in advance, I'm not really sure...