When Pennzoil became married to GTL - with their thin csts and low additive packages, I bowed out after over 20 years of use. In similar price ranges, I went shopping for Valvoline EP ( lasted a few years) - then Mobil-1 EP, which I like the most, inside the under $30 per jug crowd. Mobil-1's Triple Action formulas are the Bomb currently.
For engine treatment on our very scary Hyundai and Kia engines, I was forced to upgrade to HPL and Amsoil. No guarantees I will save either engine's life by doing so. But neither would I be guaranteed saving my life by visiting Lourdes and/or Fatima, when seeking a cure for terminal cancer (which thankfully I don't have - nor ever desire).