Welp - there's 6 different favorite oils here.
The Quaker State because it's a buck cheaper crowd.
The Mobil 1 in it's various flavors crowd. The 0W-40 members have special gold cards in that crowd.
The boutique crowd, mostly HPL with a few AMSOIL/Redline supporting members
The BMW/VW certs crowd.
The Euro crowd, which is not to be confused with the certs crowd.
I'm in the 6th crowd. That is the 'it's all good oil' crowd, though we each have our favorites. Mine is Penz Ultra Platinum in the black label bottle. There is a Penz Platinum silver label also that is a bit more reminiscent of the Penzoil Ultra Plat with Pure Plus that WAS the favorite for quite a while.
There's a fringe group that loves Rotella. We tried driving them off with pitchforks but they are crafty little guerillas.
(just kidding Rotella crowd!)