I've spent a lot of time over on BITOG and done lots of analysis on the oil in my own cars.
I've found Penzoil Platinum to work wonderfully even for 10,000 mile oil change intervals and I will be using that in my Z in 5W30 with a Purolator Pure One oil filter.
They don't make a Penzoil Platinum in 10W40 which the built motor in my supercharged Challenger needs, so I use Mobil1 there as it came out 2nd best in my oil tests over about 5 years of testing.
Amzoil, Redline, Royal Purple, Motul, are all fine oils, but they're boutique oils and I find the cost for benefit not so good.
I can walk in to Wally World and grab a 5qt jug of both Penzoil Platinum and Mobil1 and call it good.
My .02 cents no change for your 5.
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