I see a lot of people , not just with the MS3 , running Rotella T6. The last two oil changes I used penzoil platinum because it was on sale at crappy tire. Costco sells Castrol for a good price. I only use oem filters. Right now I only have a 20km commute to work but in January I will be back working on the road so I'm looking at roughly 700kms a week. I will be driving it throughout the winter . No mods. I've always run synthetic in all my vehicles but only whatever was on sale. Should I switch to rotella or just whatever synthetic is on sale ? Thanks