Absolutely nothing. My sister made the battery explode once, but that was because it wasn't tied up well.
It doesn't need a lot of gas. I just put like 15 bucks and that means like a week and a half.
It is very fast for a 4 gear car. I have left newer cars far behind with it.
It is made with the hardest steel you can imagine. I once crashed against a bus and I left unscratched.
It never needs water replacing. The water you see today, is the same you saw months ago; it amazes me until this day.
Compared to new cars, this is what Nissan should have kept making.
About the Datsun 1200 Pick up is greate, I've one and is incredible, when I buy it, I don't like because is small, but, when I went to the gas station and full it in comparation with anoter cars, and the economi is incredible.
High potential for modifications, very reliable.
These models dent like tin there made as strong as a pre fab house in a cat..5 cyclone.
Yes, I agree with your sentiments about tying your sister down - what did she do, drop a spanner across the terminals?