I'm personally an Amsoil dealer, so of course, I have my preference.
However, I'm willing to put my money where my mouth is, and I consistently run Amsoil and filter for over 20k miles per oil change.
I send my sample off to Blackstone, and they have consistently reported that there is life left in the oil every time I change.
I would rather spend more money on higher quality oil and change it less often.
I have put over 150k miles on my truck with nothing but Amsoil every 15k to 20k and no oil leaks.
Another source cemented by belief in Amsoil products was a Peterson 4Wheel and Offroad article from several years back.
They wear-tested the top 4 synthetic gear oils.
Amsoil had the least amount of wear, and royal purple was second with more than twice as much wear.
I hope this helps.
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