Depends on the maintenNce and fuel quality. Mine are good at 212k. I get excellent fuel economy and minimal smoke. Although I'm sure they aren't exactly in spec, I have no good reason yet to pull them.

Most nozzles are recommended for TESTING and service at 100k, the service depending upon the results of the test.

Greaazer I will go to when the time is necessary.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k