Hi, does anyone know what kind of engine oil the 2013 CX-9 use? Is it synthetic or conventional? The manual only says it's 5W-20. I called up Mazda USA and didn't get an answer. They want me to go ask my local dealership. However, I don't think my dealership knows either, because everytime when I get an oil change there, I can always expect a different answer. They ended up telling me they will just use whatever is in my car.