quote:Amsoil now looks like Mobil 1 from 2005.
Wow, that is a leap in logic! You compare 6 elements and TBN value, and know nothing of the other elements, chemical additives, base oils and performance.
The total package performance can better be compared with standard ASTM tests, recommended oil change intervals, and warranty coverage, in which AMSOIL always trumps Mobil 1, for the past 36 years.
The additive packages are different because AMSOIL Signature Series is a 25,000 mile/1 year oil and Mobil 1 EP is a 15,000 mile/1 year oil, and Mobil 1 is a 10,000 mile/1 year oil.