[sausagehacker]

There are a lot of oil threads, and the truth is that everyone has their own idea of what works best. Royal Purple is a resource conserving oil, and has the same additive composition as cheaper Valvoline, so there's some objectivity. Some people swear by it, so whatever.

There are a few things to keep in mind: run a reasonable viscosity oil, change it on time, and use the right filter like John said. As long as you meet those 3 criteria, run whatever oil suits your fancy.

Reasonable viscosity: 0W-30 is cutting it close, but that's the thinnest most people would advise you to run. Sounds like you already have some data for how 5W-20 sounds in your engine.

Reasonable interval: for a good quality synthetic (i.e. all name brands you would recognize), 3000-8000 miles is conservative. Some people go up to 15,000 but it's not like oil is that expensive that you need to push it.

Reasonable filter: Read John's post. Mahle OC-142 is OEM and is like $7 from our host.

You can search and spend hours (months?) reading the oil-war threads but I think you'll come to the same conclusion as what I typed out.