Valvoline VR1 10w30 vs Lucas Hot Rod 10w40

Hi all, I know I’m opening up another can of worms here, I’m currently running VR1 20w50, for the last 4 years since I owed my 340. I’ve been told it’s to heavy for a street car here in the summer months in Boston area. So I’d like to stick with Valvoline VR1 but afraid to go down to 10w30 since the 20w50, which I think has been ok. But for Dino oil in 10w40, I keep going back to Lucas Hot rod. Thoughts? Again, sorry for another oil thread. thanks