It's important to remember, ESPESCIALLY with modern diesels that they are choked from the factory with EGR/DPF systems that are there purely to reduce emissions.
Yes diesels are out of the torque band at 4k+ rpm but they still need a good blast to clear all the recirculated crap.
Every so often I used to sit my 2.0d on the motorway in 3rd gear at 70mph hovering a tad below the redline and leave it there for a couple of miles.
I put that down to the reason I never had EGR or regeneration issues.
Blast it out etc
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