I picked up some Valovline ME 5w20 on clearance for 17 bucks for a 5 quart jug and 2 bucks for some single quarts. I am running it in my 3.8 Jeep and it noticeably quieted the engine down. I've run many brands and weights in that engine and never noticed a difference among any of them. We'll see how long that lasts, but I fugure that old V6 won't make this oil break a sweat. Unfortunately (or fortunately, depending on how you look at it) I can only run a 6k OCI due to having a lifetime powertrain warranty. I'd run it far longer, if I could, because I have to add nearly a quart every 1k miles, as this engine has a drinking problem. [censored], every 6 to 7k it amounts to an oil change, so I wouldn't have a problem running it out to 15k if not for the warranty.
I like it, so far, and the engine seems to feel the same. I'm only about 2k into this run, though. I won't do a UOA because it is pointless, I think, with so much makeup oil.