Interesting stuff.I will have to check out his website.I have been using Amsoil products for many years with great results.As a prefered cust it is around 10.00 a Qt by the case and with there filters one can go 25K under normal operating conditions.When I was working I commuted 60K a year from Santa Rosa Ca to San Francisco.So 300-400K every 5 years was normal for me.Extended oil changes saved me mula and all my trucks,cars were running great with no oil burn at these high mileages.One of my Toyota trucks I sold to a buddy with 420 thousand and at 500 thousand he wanted to do a top end job and we were amazed at how clean that 4 banger looked.Synthetics have really changed how one maintains a vehicle today and 3K oil changes are just a waste of money-IMHO.