switching to synthetic

Ace, I could see how if something is supposed to have a certain amount of friction to make it work correctly, not work correctly, because the friction is less than required or no longer there. One of the reasons roller cams need stiffer springs is so the friction of the roller against the lobe is greater than the friction of the bearings inside the roller so it "rolls" instead of sliding on the lobe.

I'm not going to discount that statement because there is a certain amount of logic in it.

Chuck