I use the Red Line on my DD because of the cold soak situation, -40F for 12 hour durations in the winter from time to time. I like the polarity aspect of the ester content and the cold flow/pumping characteristics as published. The same goes for the Ravenol but it is costlier. I believe there are some VOA's for both on this site. Not sure if there are any UOA's. Search around and let me know. I have swapped all my other vehicles to M1 ESP 5W30 Euro. Cheap in comparison to the Red Line and Ravenol but good enough for everyone elses rigs I maintain.The 504/507 spec makes for some exemplary oil.