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So I pretty much know that this is a dead horse beaten 100 times over both here and on other sites. With all the different oil's out there and everyone doing slightly different things with their cars, what's the best oil to use for the track and daily driving? I currently use the 5W50 Motor craft stuff just because that's what the book says and it what I get from ford. But I also see that it breaks down pretty quickly and really isn't good for DD and tracking if you track more than once on an oil change. I have seen that amsoil 10w40 tends to be a popular option. What do you guys tend to use? Does anyone know if ford actually uses 5w50 in their race cars, or do they switch it out with something that has better sheer protection?