I ran the 5w30 in my Buick. It ran quietly enough, but burned it faster than any other oil I've tried (most oils burn a quart in 3-3500 miles, PP burned a quart in 2000 both OCI I used it).
If you're searching for a quiet oil for your 3800, my favorite oil I've found for the 3800 is actually the new formula GTX Ultraclean (5w30 is recommendation for my Series 3).
It runs unbelievably quietly. (No oil has made it loud, and I'm not one to believe things like this, but the GTX is noticeably more quiet).