THANK GOD I read this post!!! I changed the oil in my previously abused 94 TRX300fw and my buddies mint 1986 TRX350 2 weeks ago and used Quaker state 5W-30 automotive oil. Didnt ride either one just ran them enough to warm up oil and check the levels. Last night I drained the automotive oil from both and replaced with the wet clutch motorcycle oil.
The oil from the mint 1986 came out as clean as a whistle just like honey. I did not replace the filter since I just put one in 2 weeks ago.
The oil from the 94 that I have no history on looked like driveway sealer it was so black. I only ran it for at most 30 minutes over last 2 weeks fiddling with carb adjustments etc. Even the new filter was black. I put another filter in it with the motorcyle oil. Should I flush this engine with anything to clean it out? or just keep changing the filter and oil often t clear out any dirt?
This machine runs real nice just plain old dirty inside I guess
