Originally Posted By: Hokiefyd
Originally Posted By: sopususer
I've been using PP in my vehicles for about four years. But I took a look at the specs for both oils.
Pennzoil Platinum
Quaker State Ultimate Durability
The QSUD link has this in the language:
QUAKER STATE® ULTIMATE DURABILITY AG FULL SYNTHETIC MOTOR OIL
What's the "AG"? It's prolific throughout the document. I was studying the back of a QSUD bottle this weekend and don't remember anything "AG".
"AG contains Heat Activated Additives – a unique formulation specifically designed to maintain
wear protection and viscosity in high revving and extreme high heat conditions, including stop and go city
driving. As your engine temperature increases, a heat-activated friction modifier, and anti-wear system kick
in to maintain the oil’s wear protect. This advanced protective layer helps reduce metal to metal friction.
Special anti-oxidants also resists oxidation and thermal breakdown of the oil. In addition, the unique
viscosity modifier system resists shearing to help maintain the proper viscosity"