Need some feedback. Bought an '08 GS with 5200 miles and we are now sitting at 26.7K at present. I have been religious about maintenance. At the last "major" / 24K the guy that does my major services (not a dealership), but a BMW / KTM guru; told me he didn't like the color of the transmission oil. We agreed to check it after my latest 2500 miles later we check it again and again he thought the transmission oil was too discolored. He claims it has too much metal in it? Bike runs and shift great. Does this model year have known bearing issues or am I dealing with a overly paranoid motorcycle mechanic? Using Spectro.