Id like a puff of what you're smoking, 5w30 is what a HEMI needs !
That same Manual says the 8 speed has lifetime fluid

Make sure you follow that to a T as well
I swear some people would throw rocks in the engine if the manual called for it.
Around here, throwing rocks into the engine is unnecessary.
About 8 years ago, a customer brought his wife's BMW 335i into the shop. The problem was that the serpentine belt had shredded as she drove down the Sam Houston Tollway, AKA Beltway8 when the A/C stopped blowing cold, the alternator stopped turning as per the battery light, and the power steering became non-powered.
Fortunately, the coolant was/is circulated by electric pump, other wise her human nature of "I gotta get home" proclivity would have cost the engine

.
Several of my customers over the years have done egregious harm to their vehicles, because "I gotta get home" took over all reasoning.
I commenced to examine the 335i and found the belt shredded lengthwise into ribbons which were tangled into the pulleys.
I also noticed a LOT of silt/sand everywhere under the hood, and assumed they took the car to the beach.
When I queried this man, he swore on everything dear to him that the car NEVER went off road, beach included.
OK then where'd the sand/grit come from? It was inside the air filter housing as well.
Either way, I fixed the car, cleaned everything up, and sent it on it's way. But the whole thing bothered me.
A few weeks later, I got my answer. As I was driving through the neighborhood, one of these Yard Crew outfits was finishing up on a yard with the back pack style blower (The Typhoon7000 by Binford Tools!

).
This ignoramus idjit was blowing clouds of this silt, grass, sand, dirt, at typhoon velocity up under a car parked on the street! My "AHA" lightbulb came on, and I called the BMW customer, and, sure enough, His wife parked the car in front of her office where the landscape crews came through 2-3 times a week, Blower(S) included!!!!!
The cloud formed when I witnessed it enshrouded the entire the breadth of the street!