I have a 2008 RAV4 4 cyl with 60K miles. I have used 5w-20 dino all its life until this fall. My oil usage over 5000 miles was about 1/2 quart. Decided to switch to M1, 0W-20 synthetic in December. I have 1300 miles on the oil and its down about 5/8ths quart. Would synthetic or zero weight oil make that much difference? I like the synthetic as it starts better in the cold of Minnesota but I am not liking burning it at this rate.