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I just changed my transmission fluid (SYN 3) on my RK after a little over 5000 miles. When I was draining the oil it literally looked bran new out of the bottle! I know the manual specifies 5000 miles, but it seems like overkill. Especially when the manual transmission fluid change intervals on cars & trucks is so high. :dunno:
 

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Tranny oil looks new because it sees no combustion. It will lose it's viscosity and will breakdown over time and miles. I change mine every 10,000 miles and I know thats overkill.
 

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I change mine every 5,000 when changing the primary and engine oil. doesn't cost that much and not that much effort. It may be overkill but I plan on keeping this bike for some time.
 
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