Runs cooler is it, my understanding is about half of eingine cooling takes plsce in the oil.
My GC filter, does require about 1.5 gallons perchange, which i do about once a month. So you will use more oil. However having said that, you will always have plenty of fresh additives in the oil, which do get used up as the oil ages.
But application should dictate use. Unleess you have an extremly sooty engine or do heavy haul i think the AmsOil bypass system is the simplest.
Using amsoil itself is kind of a pain as you have to carry it with you. Not so much a problem if you go home once a month. I use it, but i carry a case in my tool box.
K had my head off recently and the mechanic said my sleeves showed almost no wear at all, which considering i have 800k on the truck, and havent changed the oil in over 400k, is quite a testement to the GC filter and amsoil. The main thing seems to be to keep the soot foiltered out and the acids nuetralised.
Also, 60 bucks a month on oil is alot less than 189, which is what i used to spend. If I used the Amsoil bypass filter in place of the GC, my expense would be half again.
I use the amsoil bypass on my generator.
I will be putting amsoil bypass on my wifes car and my Duramax truck, when i finally leave this bussiness next year.
Incidently, even the AmsOil literature ranks regular "Delvac" as almost as good as there product but higher than some synthetics. So delvac with a bypass sysstem should be good enough.
One other thing, when i switched to amsoil my mirrors quit vibrating so much. I know that is subjective, but both my wife and i noticed it on the first trip we took using amsoil.l