The "All About Oil" link was a very interesting read. I found it really interesting that Mobil 1 is not a synthetic oil, but rather a Group III petroleum oil. The section on oil filters was interesting also. It rated the Amsoil oil filter as the only one of High Quality, but doesn't seem to explain the reason why.

Tom

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)