When looking at my vehicle, i noticed grease streaks dripping from a line on my alloy wheel. after cleaning the grease off, we noticed a crack completely through the spokes on my rim. this is the second time this has occurred to my vehicle since we bought it but i was told there is not a pattern of defects. i was told on both occasions, at mazda dealer service departments, my vehicle was unsafe to drive. mazda usa told me no pattern of incidents have occurred and its not a safety issue on their end although their service departments say otherwise.