It's been two weeks since I ordered the oil from the Mazda dealership and it still hasn't arrived. There really is nothing these dealers can't screw up.I used Mobil1 Advanced Fuel Economy for first oil change after the free one at the dealership and there's just something about it I don't like. Granted I did the change in October right before a really cold winter but I feel like the fuel economy isn't where it should be. The engine has some jerky acceleration too, now that I'm about 7,000 miles into the oil. I'll be sending a sample to Blackstone when I do my oil change in the next couple of weeks and will post the results. I'm hoping to get the Mazda OE oil at a decent price and use that and the OE filter this go around and see if there's a difference in feel. The Mazda oil has great lab results compared to the other oils I've considered.
New 0W-20 Synthetic Motor Oil from Mazda - CleanMPG Forums