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I'm currently running their 5w40 and have had success with other weights in the past. But i've recently heard that they are very secretive and are possibly not a "true" synthetic. Any info would be appreciated. I've also used M1 5w40 truck/suv until it was discontinuted and also M1 10w40 HM.

I'm looking for some input from people with that are more informed about this type of thing than myself. I've read on this site for a while but some of what I read just doesn't click. Just as I could spout off tax law and such and people look at me like . Anyway, I switched to symthetic (M1)...