My VIN is one of the cars from a Mazda Differential Service Bulletin. (See attached Bulletin). Bought my NC1 used. Two owners before me. Called up Mazda and got Service History. First owner got Diff Oil changed at 77.000 miles but I still have the whine when I hit 50 mph. I will get Diff oil changed again since it is now at 114,000 miles. It's not loud but there right at 50 mph like clock work. Here is a video I made.Fast forward to 45 seconds on video. FYI: Video portion does not match Audio at end of video."2008 NC1 Mx-5 Grand Touring Automatic"
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