EGT settings

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EGT is important because your turbo is sensitive to it - too much and you could see damage to the bearings (either directly, or through oil burning and forming varnish on the bearing surfaces).

It's also an issue with those of us (D40 owners) with DPFs - Diesel Particulate Filters. If the EGT is too low, the DPF fills with diesel soot and if that isn't cleaned, it costs a bunch to get Nissan to fix it. EGT too high and the medium inside the filter can be destroyed.

If you drive a turbo vehicle heavily and stop the engine suddenly, the EGT is high and the lubricating oil inside the turbo charger stops flowing and just burns up. This rapidly causes the destruction of the turbo charger - so either using a turbo timer (which keeps the engine idling and feeding oil to the turbo charger while it cools and spins down) or monitoring your temperature and shutting down below a safe level (eg 200C or less) is important to the turbo's longevity.

And that's why we're interested in it. Hope that answers the why for you (and anyone else that was wondering).
 

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