I don't claim to be any kind of expert in plastics. My college degree is a BBA in accounting and pre law. But I have owned trucks since 1964 and have used these type of bolts since they hit the market in the '70s and I have many years of real world experience with these bolts and the washers that I call plastic. They do not compress nor do they "ooze'" out. I have tried so plastic suspension bushings that are supposed to last a lifetime. But they were a total disaster. The old fashioned rubber dry bolt bushings run a half a million miles or better on my equipment.
