Search results

So, I've got a 2007 Mazdaspeed 6. The engine has been built with forged internals. Big turbo and dyno'ed at 600 AWD WHP. The OEM oil recommended oil is 5W-30. The engine builder recommended 10W-40, or even 15W-50. The later seems too thick to me. My performance shop recommended Motul...

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...