My 89 XJ has a blow by problem that most of theses XJ's do. It doen't have a ton of miles on 115,000 or 120,000 can't remember right now. The blow by is extremly annoying and I think it's cause a loss of MPG. Can I just replace the rings on this engien since it has fairly low miles. I wouldn't think a complete rebuilt would be in order. What do you guys think?