Originally posted by: CRXican
Valvoline
avoid Penzoil at all costs
Nothing wrong with Pennzoil. They're average/above average, actually.
Avoid:
5W-30/10W-30
Quaker State Peak Performance
Quaker State Multigrade
Castrol GTX
Wal-Mart SuperTech
Mobil Drive Clean Plus
All of these oils perform about the same. There is nothing really wrong with them, they just spec lower than other readily available oils.
Surprisingly, Havoline and Valvoline's synethetics rank right up there with AMSOil and Red Line.
Just above Mobil1 SuperSyn.
However, Mobil Delvac 1300 Super is a
conventional oil that specs just as good as Mobil1 SuperSyn. Of course, without some of the benefits of synthetic - like an ultra low pour point.