Low engine temperature can cause problems but I wouldn't descibe 82C as being very low.
You really need to take it to a diesel specialist as most dealers know little or nothing about them but a good specialist will have had the problem before and know what it is.
This is a similar engine to the Peugeot/Citroen one, they can suffer with turbo failure due to degraded engine oil, to keep yours trouble free I would change the oil at at least twice the recommended intervals.
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