I don't know if I have a favorite as I just started getting I to oil, but I just replaced my RP with Chevron Supreme and my engine is running more quiet and smoother. Pretty wild. I am very happy this far.
+1. It really quiets my engines and just makes them feel like they accelerate smoother. (Butt dyno of course. )
My previous favorite was PP but i am liking GT1 a little more now.
When I was a kid and started driving in 1994 I bought Mobil oil because the bottles looked good, and it seemed very Americana for some reason. Ived used mostly Mobil products ever since.
Kendall Full Syn and Rotella T6 for the legend (smooth and quiet) and PP and PU for the Ridgeline (same reasons). Haven't tried QS Defy or NextGen Maxlife yet though both in my current stash.