...and I have decided to go with the Mobil 1 EP. All have been great oils as I have tried Amsoil ASM, TGMO, MGMO, Mitsubishi and the likes. For the price, you can't argue with $5 a qt Mobil 1 EP. Mazda oil made my engine sound a little rough, ASM did a great job etc. I think it's a matter of...