Hello everyone. I drive Subaru Impreza RS. 55 000km so far. I been using M1 for 1 year, but didn't like it. It burned lots and engine smelled like burned all the time, I guess it was starting to penetrate seals or something. So i transfered to Castrol GTX with pretty good results. No oil burning, well very little and so far no problems. The question I have which dino oil I can use which is better then GTX?? Also I live in Canada, it gets to -30C sometimes here. Most of the times it's not that cold. Thanks you.