Further research proves that a FULLY synthetic 20W50 is recommended for high temps.
Im looking at Castrol Activo 20w50 and Dave Lambeth recommenes Millers CVT oil. Its not motorcycle specific but its designed for wet shared sump engines (like bikes are)
I emailed a guy who works for shell and he said oil is fine upto 150c as long as its not all day everyday and the temp should bother the oil if its changed at correct intervals etc.
Its pretty much what I thought but I wanted to be sure.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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