Well I switched from 15w40 to 5w30hm for winter. And it went from using a quart every 1400 to 600 . Not exactly thrilled . So opinions maybe start putting In 10w40 when its low? And that would be ok in possibly as cold as 0 to -10 or should I just stick with 5w30 and never change the oil again. I figure as much oil as its using I can just add it when it needs it and replace filter every 5000 miles. What do you guys think? Car runs great doesn't smoke . Just uses oil thanks to saturns "great" engineering. Thanks guys.