I'm sure this'll get some backlash, but I'll tell the story anyway. The car is actually a 'certified pre-owned' in Mazda's executive demo program...some Mazda exec put 2000 miles on the car and sent it off to be sold. At 2059 miles the dealership changed the oil and put it on the lot. I noticed the sticker on the windshield yesterday and became curious about what they might have put in the engine, so I called them. The girl I spoke to said they use QS 5W-20. I glazed over. My owner's manual states 5w30 only, across the board, regardless of climate. Keeping my turbo in mind, I ran out and bought a filter and got mentally prepared for an at-home oil change last night after work. During my drive to get the filter, the service manager called to apologize for the mis-information, and that he actually keeps 5w30 on hand in the shop for use in Mazdaspeed vehicles, his techs are trained to use it in Mazdaspeed vehicles, and not to worry as my car actually got 5w30. So....do I believe him? If it did get dino 5W-20, does anyone here think it'll hurt anything?