Wolf, from what i have gathered from watching BITOG the stuff is nothing but *censored rant based upon the general opinion, think clark griswold from the movie christmas vacation insulting his boss, but with profanity insulting lucas instead*
I would personaly not use it, it is pretty much a heavy oil that increases the viscosity rating of the oil already in the sump. which for a modern engine is not good at all. If you want a heavier oil, just buy a 15W40 instead of spending a ton on the lucas product that does absolutely nothing except make your XWX into a heavier product that you do not know the actual rating of.