I have used Boeshield for the past couple years, and I really like it. After if stopped being imported to Canada, I tracked down a marine shop that carried it. About $20 for a WD-40 sized can. I found you really have to start with a very clean chain, and let it sit after application. Not totally noiseless, but close. It was developed by Boeing to protect aircraft parts from oxidization, whilst providing lubrication where needed. Did I mention it smells really good, can't remember
