nissan trouble

[MOTOR 1]

hi i hope someone can help my nissan mistral drives fine but my oil level has risen on dip stick but im not losing any water not sure if diesel is getting in is this possible with this model it is a 2.7 td.

[TWR]

Yes, It is possible Motor 1 where the Injectors sit in the head there are Injector sleeves just like the pistons there is a possibility one has cracked.