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I have just had an official response from Nissan Australia.
“The dust has gotten past the air filter and through to the engine. The engine bay showed signs of severe off-road driving conditions and was covered in dust. The case of the concern has been deemed as environmental due driving conditions”.
The current dust in the engine bay came from a trip to Arkaroola in May, about 300kms on a well graded road. But Nissan is saying their car is not designed for Australian outback conditions.