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I use a high grade 10w40 for the engine and I got some synthetic 90 wt for the back gear box. If you run yours really hard you might want to look at specialized motorcycle oil. I'd use straight 30 weight for summer only but it's getting hard to find so I'm using 10w40 year around. That's what I do, when it comes to oil everyone has an opinion. With a GY6 engine you have sliding friction on the rocker arms/cam, a timing chain, bushings and roller bearings.
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