I've racked up over 75K miles on different bikes using Rotella 15W40, I did try the T6 Rotella 5W40 in my TT 250 for a short while but I experienced clutch slippage in the cold weather until it got up to operating temperature so I switched back to the 15W40 and haven't had a problem since. In my opinion for the money you can't get a better oil.
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2016 CSC TT 250, 17/40 sprockets, JT 428 chain, Stock Keima carburetor with needle raised 1 notch and 115 main jet. Modified stock exhaust, Tachometer/Digital cluster upgrade. LED headlight, Superbrightleds 1157 Tail light bulb, Shinko 705's 90/90-21 and 120/80-18.
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