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In general, folks in the US are running quality ULSD. That's a good point though. Some folks cruising in remote corners of the world could be getting some sketchy fuel with mixed sulphur content. How does that change the equation?

Hi All, I've been browsing this forum for about a week. Folks - I have to hand it to you, there are some seriously knowledgeable people on this board. Thanks for offering your knowledge up so generously. I'm currently reading the Motor Oil University write-up and I'm seriously impressed. In...