hmmm we had a 720 for ages, and is had the z22 diesel and it went and went and went and went.....
just not very well, but considering my dad siezed it twice and never serviced it in the 10 years that we had it it went well.
When it siezed, we just let it cool down, then refiled the oil and away she would go again!!
It eventually went to the caryard in the sky when two undercovers on trailbikes were smoked out when we were towing a huge load up a steep hill. The old girl was working a wee bit too hard and your couldnt see the car from the smoke. Not sure about the petrols though.

Overall, a gutless, slow torqueless heap, but it wouldnt die no matter how hard I thrashed it. Typical datsun really..