I have had great luck with the reliability of my 2 previous Bonne'*, and my Caprice as well. I hope to have a good experience with my current Bonne as well.
There is some truth to the idea that a car that sits too much gets more problems at times.
I have driven my cars pretty nicely, and a little hard at times.. so, the first rule is not to beat the crap out of it.
If you dive a few miles here and there around the city each day....that'* going to make trouble, in my opinion.
Last year, I bought my Caprice Classic LS 9C1 with 99,000 miles. I joined a forum that has a lot of info on that car. It seems at 100,000 miles we are expected to replace the optispark, transmission, and water pump, which all adds up to 2000 bucks, or less. I don't drive like the animals on the forum, but I do drive a lot. I drive a lot of city, and a lot of highway, and I believe the highway trips make the engine and everything work itself clean, and give it less chance for build-up anywhere. I drove this Caprice 27,000 miles this year, and I have replaced brakes, and a fuse, and of course, fuel filter, air filters, and oil/filters. I also use Mobil1 oil in my cars when I buy them used.
I bought my 1994 Bonne with 108,000 miles, and drove it about 3 years, and sold it running strong at 161,000 miles. The new owner beats it daily, and since he'* young, and just tosses the keys under the floormat and leaves the doors unlocked, his so-called friends have stolen that car from him, and beat the crap out of it on 3 occasions. The car'* body now looks like crap, and he had to replace a hub assembly, and an aluminim wheel. The car is still running strong, and has a couple small issues.... not bad for that kind of abuse and milage.
As for those who like to detail their car and engine...you are sometimes inviting trouble if you aren't very careful. I have a couple friends who are like that, and one guy always has car troubles, and many times his issues were caused by him bumping things, and making a bad electrical connection somewhere, and one time he bumped a dry-rotted air intake rubber elbow. Between his lack of care, and over use of water and steam, he has been his beautiful car'* worst nightmare. He'* also one of those who putts around the city 9000 miles a year, and almost never takes a long drive.
Many years ago, my dad said if I'm going to the store, or making a short trip...drive the car at least 5 miles to circulate the oil....he said making a lot of those 1 mile rides would be sure to kill a car early. I believe this.
Another enemy is those who like to start the engine, and throw it in gear and go......sure, the fuel injected engines can go without a warm-up period, but that doesn't mean a warm-up won't help. This is especially true in areas like mine where we get bitter cold winters.
These are my thoughts and opinions, and I am aware of the fact that it seems some folks do everything to keep a car running and looking great, and have terrible experiences, and then there are those who pound the crap out of their cars, ..never maintain them, ...and they sometimes have more reliable cars... who knows....