Xray oils seem to run heavier than everyone elses. 30wt Xray is closer to 45 - 60wt of other manufacturers. Most of the team drivers on xrays site use 30wt and then open and close holes in the pistons to get the desired damping. I have seen a few 35wt and 25wt setups but not too many.
BTW, anyone know who carries 25 and 35wt Xray oil?