Pennzoil and Quaker State are two of Shell’s motor oil brands.
Didn't know that. I use Shell Rotella in my lawn and garden equipment and Pennzoil semi synthetic 2 stoke oil in my outboard.
I used only Valvoline for years until they started marketing recycled oil for the same price as normal oil.
Just not sure yet about the new Pennzoil. I guess I'll watch and see what Roger Penskie (sp) does in his race cars?
A friend works in one of Penskie's Mercedes dealerships and he tells me the Pennzoil Ultra (Old Version) is certified to work in the new Mercedes.