OK, so I've been lurking here for a while doing some reading. Seems like a lot of you guys have a lot of experience and have read a lot of uoa reports. I'm looking for a good synthetic oil to run due to the cold weather and the possibility of extending the OCI. What oil in these engines puts up the best UOA? I'm not looking for opinions, would like to see data to back it up. It looks like the most popular choices would be Mobil 1 (Delvac 1 & Turbo Diesel), Rotella, and amsoil. Maybe they are all pretty equivalent when a UOA is performed?