Manufacture date GUIII 3LTurbo Nissan Patrol

I am amazed at the immense knowledge and information on the Fourm. I recently perused the articles on the Nissan Patrol where some owners have experienced problems with the Series II model Patrol and the information would seem to suggest that problems have been rectified in the Series III 3 Litre Patrol. I am trying to identify when actually the Series III was manufactured. I have made contact with the Nissan Customer Service Centre and 3 different officers have told me 3 different dates. I was informed that the 3 Litre commenced with the introduction of the 2 clear reversing lights; I was then told that the 3 Litre commenced with the new badge and the grill but no changes to the motor-only cosmetic; the 3rd officer told me the Series III is a series III because it was put out in 2003. I purchased my 3Litre in December 2002 and am trying to establish if it is a Series II or SeriesIII. So far I have done 65,000 kms but with hearing all the stories of motors blowing up I am always weary when travelling in isolated areas touring around the back blocks. Can anyone please assist me with this information on the month and year the Series III was released and what changes were made to the motor. Thanks in anticipation.