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Have a read of this thread; http://www.nissanpatrol.com.au/forums/showthread.php?4421-Caring-for-your-diesel&highlight=gren02

Tony

One of the major causes of early build ZD30 engine failures was PCV (positive crankcase ventilation) oil vapours travelling back up the inlet ducting after engine shut down. This oil mist eventually...

Welcome to the forum Amanda, feel free to post up an intro about yourselves in the introductions section.

Below are 3 posts about your question. Have a good read through and if you need any more...

G'day Robbo, welcome to the forum.

Your best bet is probably to have a look at the reference document found here; ...