DGXR
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Whoa I have not checked back here in a long time LOL. Sorry about that. The hard starting was not completely attributed to the oil... the XR400 is just a cold-blooded beast and I have finally figured out the starting routine -- you have to basically flood it to get it to cold start below 40F.
I have been mixing T4 15w40 and T6 15w40 with good results -- I don't need the 5w40 viscosity anywhere that I ride. The reason I don't use T5 is because it does not have the MA/MA2 mentioned on the back like T4 and T6 have. Yes I know it says "meets specifications" and not "properly certified" by JASO but that's fine with me.
I have been mixing T4 15w40 and T6 15w40 with good results -- I don't need the 5w40 viscosity anywhere that I ride. The reason I don't use T5 is because it does not have the MA/MA2 mentioned on the back like T4 and T6 have. Yes I know it says "meets specifications" and not "properly certified" by JASO but that's fine with me.