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gear oil exc

  1. Off-Road / Enduro
    New to all this oil changing malarkey! Got an 09 exc, bought it new last year. the oil my ktm dealer has supplied me Is Fuchs silkolene 10-40. I am about to change the gear oil but the manual states I should use 10-50. I have a few litres of 10-40 to use, should I continue to do so? Bike is...