first off amsoil is not a additive. at what point would you say this ansoil i use is gonna get so bad it will stop up my oil filter? sounds like one mans opinion to me. if reg. oil could have done the job there wouldn't be no need for synthetic oils to start with. if you want to believe everything the oil co. tell you , it fine with me. why wouldn't additive people tell you to change you oil ever 3000 miles, that's the only way they can sell you anything. i don't use additive in my cars i don't need to, and by the way the only filters I've ever blown off a motors had reg. motor oil in them.