I have put RP in both my Ram and my Grand Cherokee. I found that the RP really quieted down my "Hemi Tick" a good bit more than than the Mobil 1 I was running.
The GC also responded quite well to it, picking up a solid 1.5 mpgs after the change (well until I lifted it and put larger, more aggressive tires on it).
Currently running Valvoline full synthetic because the auto parts store had a killer sale on it when it was change time.
I almost always run a Wix filter, but have used Purolator Pure 1 and Mobil 1 filters. Those three along with the K&N always get top reviews.
Fram ALWAYS is the worst filter tested in every review I've ever read.
I'm not really brand specific on my oil, I'll stick with a name brand, full synthetic every time though. I'll change my oil and filter every 6k miles or every 6 months, whichever comes first. It's usually 6 months on the truck as I only average about 8k miles a year.
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