Yesterday I was looking through a 2020 Dodge Challenger Owner's Manual at the oil specifications. The 3.6L V6 (305HP) and the 5.7L V8 (375HP) spec 5W20. The 6.2L V8 (supercharged 700+ HP in 3 configurations) and the 6.4L V8 (475HP) normally aspirated higher performance engines spec 0W40 oil.
At one point, Dodge put out a TSB that the 5W20 oil MUST BE USED so the multi-displacement system (MDS) cylinder deactivation system will work properly on those engines that are equipped with it. Yet the 6.4L is spec'd for 0W40 and it has the MDS version of the engine when it is connected to the automatic transmission. The weight of the oil affected the timing of when the engine would transition to/from 4 cyl. to 8 cyl. mode.
But, the 6.4L engine is essentially a bored out version of the 5.7L (with a few other modifications to make more power) and the difference in oil spec is interesting. 5W20 - 0W40.
DEWFPO