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    Oil recommendation for build Mazda Speed 6

    So, I’ve read a lot of threads. People like M1, PP, RL, Amsoil, etc. All good oils. So, the application is a Mazda DI. Engine recently built. Car is a 2007. Will use break-in oil at first. Stock recommendation is 5w-30 I believe. Not concerned about Mazda warranty, that is long long over. So...
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