No.
It does not get that cold here in the winter, so I don't bother with the 5W, a 10W gets it done ok.
On the hot side I figured I would be better off with the protection of a 30 weight compared to a 20 weight, since all the internal clearances and lash adjusters are the same as the older engines that took 5W30.
I use 5w-30 amsoil in my cobra. I'm thinking of running 10w-30 in my new engine though. The piston to bore clearance in my new engine is larger than stock. I will run at least a 5w-30 though. The engine was assembled with 50 weight oil.