"My buddies 5.9 360 on his 1996 dodge ram 1500 needed an oil change. Keep in mind this engine has 260,000 miles on it. As he was pulling in my driveway it started knocking. We decided to change the oil in the morning. When we were at the store we picked up some Lucas Heavy Duty Oil Stabilizer and put that plus 4 quarts of high mileage part synthetic in. Started her up......the knocking was gone. I absolutely could not believe it. Your product works miracles." -John Bye