hapco industries, out of fraser mich,PRoduce products that work very well in regards to your problem.it will not affect the chemical composition of your oil you can usually find it at quality auto part stores .(hapcos main stay)is an excellent choice it works without over swelling the important internals within your hydraulics or engine. just follow the directions as recomended by them they produced a product called (cop a slip) some years back. it was very potenent in treating general motors rack and pinion whoes, dealers where actually installing it as a sucsessfull remedy to the squalling/binding/and stiffness problems.very nice products overall! i am not recomending this as an alternative to a serious problem with a cylenders internalls. however these products do work!! as many know few promises in a bottle do. i hope this helps.