From my research the y62 is a very reliable vehcile. If you do a google search for y62 reliability or issues nothing comes up.
They seem to be heavily engineered and the drivetrain unbreakable. In fact nissan spent a huge amount of hours bashing it offroad in the middle east during the research and development perfecting it. I can tell you that crawling under the y62 everything is huge. I work with trucks and the y62 diffs are huge and the chassis is massive, bulky.
The fact that people are extracting huge reliable power from them isnt surprising and its a mystery to me why they dont sell more of them over here in greater numbers. In the UAE they are the number one selling vehicle, with sales growing year on year and they are pretty much the same price as the land cruiser:
United Arab Emirates August 2017: Nissan Patrol up 67% to 10.3% share – Best Selling Cars Blog
The people in the UAE regard the Patrol as the toughest and most reliable SUV in the market and thats why sales keep growing.
Whats even more impressive is how dominant the Toyota propaganda has been swallowed in Australia hook line and sinker. The way they've brainwashed people into thinking they are so reliable is amazing, when in fact they have issues in nearly all they're flag ship models. I now understand why Toyota forums are so hard to join, Toyota reliabilty is near impossible to Google and why they charge so much for their vehciles. People in Australia love the BS and as a result they charge stupid prices for outdated crap....
The y62 doesnt have a diesel option and if allowed and encouraged can drink heavily but the fact that its so reliable will more than likely make it the cheaper option to run over a 150,000+ kms i think. Thats why they haven't bothered putting a diesel in it. "If it ain't broke don't fix it"....my opinion.