I have a 2005 Dodge Ram Laramie Quad Cab w/a 5.7L Hemi with about 995k miles and runs as good as a new truck.
I use Royal Purple oil 5w-20 and RP filter.
This truck takes 7 quarts.
I also have an 09 Smart ForTwo Passion with 50k and I use Royal Purple about 3qts. oil/filter 5w-30.
and when it comes time to change oil in my Raptor 660R, I will be using Royal Purple oil and filter in it.
04 Corolla
Out: whatever Toyota dealer put in 3,000 miles ago
In: reuse Toyota filter, 3qt of Nextgen conv. SN 5W-30 + 0.5qt of Valvoline conv. SM 5W-20