I've made it to 495K on the original injectors and now runs a bit rough and at idle noisier than usual. Research tells me I have a bad injector(s). The one, by nearest the Fan has signs of leakage by the hold down fork/bolt. I'm thinking of replacing all 4, but wish to know if I need new O rings. The reman Bosch injectors come with copper washers.
BTW, I had to replace trany at 463K. Don't make them like they use to...LOL

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'06 Liberty CRD Inferno Red, GDE ECO Tune,PVC Oil/Air separator,Airtex in-tank fuel pump, Magnaflow exhaust. 300K Hd gasket replaced, Weeks kit.
6/5/2011 - 68K miles
11/2012 - 116K
07/2013 - 168K
04/2015 - 255K
07/2015 - 265K
02/2016 - 295K
07/2016 - 302K
06/2017 - 327K
12/2018 - 398K
03/2019 - 405K
10/2019 - 436K
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The o-ring on the injectors is only to center it and keep debris from falling in the hole. But the injectors can be rebuilt by any Bosch certified shop for less than the cost of buying new.

I'm impressed at the total mileage though - have you replaced the valves? If not, PLEASE do, that is a major risk once they get above 200k miles, your mileage is way over that.

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Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 125 CRDs currently driving with my timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

Wow, 495K!?! All trouble free until now I assume?

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2005 Liberty CRD, with 135,XXX miles. Rockers, exhaust valves, Provent, EGR block & butterfly delete & V6 air box at 100K

1998 XJ 4.0L, stock with 130,XXX miles

First Jeep: 1962 Willys CJ-3B