12,000k might be ok for larger engines, but if your oil is starting to darken badly, or the engine begins to play up (smoking, hard to start, gearbox does something unusual, funny exhaust smell etc) then change the oil and filter and see if it clears the problem up.
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
"What Steve said pretty much summed it up."
"I did axactly as you said and it worked...!!"
"Wow, Great advise there DB."
WTB: Hyosung bikes or going or not.
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