I'm sooooo ashamed of myself that I totally missed this post. I must be slipping. As a self-proclaimed and self-appointed "Royal Purple" evangelist, I HIGHLY recommend Royal Purple 0w-20 (http://www.amazon.com/gp/product/B005SEK9IQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00) and Filter (Amazon.com: Royal Purple 10-2876 Extended Life Oil Filter: Automotive)! It has been the BEST oil for me, especially after 3000 miles have been clocked, and the car is as chipper as mile 1!:grin2:
I'll second this....I let Mazda do the first few free oil changes that came with the purchase of the car, but after those were done I've used Royal Purple 0w-20 & the Royal Purple filter and the engine seems to run a little smoother.