noisy? you bet. sounds like someone poured a bucket of marbles down the intake. but its done that since the day i bought it 100 thousand miles ago.well over 250 now and runs like new. just noisy.
Mine is kinda strange at 230k, I can hear all the pushrods and rockers moving around in there, not bad just obvious. And some rattling down lower, but it has a tick that sounds exactly like a lifter. It ticks for 20 seconds then goes away like a switch is flipped, then 20 seconds later it comes back, etc. Not a gradual increase or decrease, just an on and off kinda thing,
My 2000 has right at 126,000 on it. Only replaced the valvecover gasket, and going to replace the oil filter adapter o-rings soon. It has one lifter that will sometimes tick slightly when it is cold outside (below 30*) for a short time then goes away. Never does it in warmer weather.
Oh and about the 21 mpg thing..... I can get right at 20 mpg out of mine on the interstate.
2000 Cherokee Sport
4.0L / AW4 / NP 242, blah, blah, blah...
[B][COLOR="Sienna"]A lot of parts that cost a lot of money[/COLOR][/B]