Spark plugs intervals are different but not by much...6.4 is at 96K and 5.7 is at 100K. The online chilton manual lets you compare PM for an RT and SP...did not know about that option.main difference is the 6.4 engine has more frequent oil changes 6K / 6mos max vs. the 5.7s which is 10K / 12mos max.
The 5.7s can go off a bit earlier than 10K if driven in more demanding conditions (hot temperatures, mountain grades, lots of idling time in traffic) - and the system will trigger sooner than 10K
The brake life might be a little shorter with Brembo brakes, but this like tires, is affected by driver habits and driving conditions.
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