My question to you so called expert on synthic oil. Does it really matter since Mobil 1 synthetic is so much improved by the virgin oil analysis, that it wouldn't really matter using Amsoil series 2000 vs Mobil 1 with oil change within 10,000 mile range. It seems these two synthetic oil are the most popular and Mobil 1 can be easily purchased at Walmart, I'm wondering if Mobil 1 got an edge in it's availablity and marketing if both perform to it's equal. Been an Amsoil user, but Walmart is just down the block....