What Oil to Use?

I just got a 2001 wr426 which I paln to run street & trail (Have a baja designs kit coming). I live in NJ so it is not too hot. I typically use Yamalube 20-40W in my Raptor, but only use it for trail. I am thinking of synthetic as it may hold up better for limited street use. Any suggestions?

Amsoil synthetic 10W40 or 0W40 motorcycle oil is an excellent choice.

Mobil 15w50 full synthetic (red cap)

I switched mine to red cap too, right after break in. Synthetic oil is wear proof...

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