This one goes out to all those with either the 2.5 or 4.0 whose lifters are making noise or have made racket in the past. I know these engines are known for doing this. my question is how loud or how long should I allow this to carry on before I seriously consider rebuilding the engine. has anyone else experienced this and allowed this to carry on until the engine just eventually gives out or can this run for 300,000 miles? Currently I have a 2.5 with a hundred fifty thousand miles runs fine, starts fine, just makes a lot of noise and very annoying. Just curious many thanks in advance for all questions comments and concerns.