It's my understanding that upper RPM ranges on diesels is perfectly safe. That's why they have no redline on the tach. I cruise at at least 75, sometimes I'll push it to 85-90 to get past people or to piss someone off who's trying to pass the slow, old diesel. That will get her up and over 4000 RPM.

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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