I have a 1995 Jeep Grand Cherokee with the 4.0 it has about 160,000 on it. It has developed a slight knock and ping when going up grades on 87 gas,So I went and bought 3 bottles of Regane. I have already put one bottle in the system Im going to wait until after the next two fill ups and then add another,and then after 1,000 miles after that Im gonna add the last bottle. So hopefully it will clean the engine deposits out. Their shouldn't be too many this engine averages about 23-24 Mpg. How does this "Plan of attack' sound ?