just changed my bearing in my 09 m8 with 1000 miles on it, no symptoms but when I tore into it the bearing was shot.
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Sorry to hear your having trouble.
Looking forward to hearing what BDX has to say. Be sure to ask them about the angular misalignment problems, and get them to clarify where they are taking material off of the track shaft please.
I got one of the guys to tell me what that oil is. I called my AMSOIL tech line and it is the same thing as AMSOIL chain case oil, click here. Its no special oil, a straight 5w 100% synthetic oil. They did say do not use ATF in the DD. If anyone needs AMSOIL chain case oil let me know, and Ill get it out to ya. Comes in 12oz bottles, or a case of 6. You get 72oz of AMSOIL for the price of one 15oz bottle of BDX oil shipped to you.
Got over 400 miles on mine so far and its working fine.
TTT