I had a Mobil 1 and Amsoil filter for a Toyota Corolla side by side comparison at my uncle's house a couple weeks back and we both agreed that the they looked EXACTLY the same down to the stamping of a number on the inside, I wish I took pictures. Not saying they had the same filter media or that they're all the same across the board but I wouldn't be surprised.
*disclaimer*: all that I say may be true or I may be completely wrong and I accept that.... please, it is your duty as another person on the internet to tell me (in-politely) how wrong I am :) "The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy This is what happens when you leave your Z parked outside too long:
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