they say it has the same properties when up to temp. but I personally think that's B.S. Thicker oil is thicker and thinner oil is thinner....I want a thicker cushion between my rotating engine parts when I'm up to temp. 0 weight just won't cut it on these motors (at least for my redline drivin')...that stuff was made for inline 4 cylinders...just like castrol.
And no, I don't boost when the oil is cold but ALL the turbo guys know ...we LOVE to boost when it's cold outside!!!!