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I too use Rotella T4 in all my bikes. Used T6 for a while in the quad because it runs hot but switched back after installing the oil cooler. It's convenient to use the same oil in all the bikes, its readily available, not expensive, and it works. The original CG engine in my Lifan still shows the cross hatch honing marks on the cylinder walls after 50,000 miles, using T4.
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