The 420A (SOHC) and DOHC engines used in the neon are very basic mechanically but because of that are mechanically quite sound. Chane all seals as they die (often for OEM stuff) with FelPro and the like and keep up with sensors dieing and the powertrain should last for years.
My friend had a '97 that blew its rear main seal on my garage floor, one week after changing the oil (QS I think). There was nothing on the dipstick. In spite of my advice he decided to drive the car fifteen minutes down the road, to his mechanic's shop. I dumped some Valvoline into the engine and decided to tag along because I had never experienced a ceased engine before.
Well, I didn't get that chance that day. Bloody thing kept running and without a hitch. When we got to the shop the mechanic's eyes doubled in size so we popped the valve cover off to see what was up. Nothing terrible at all, below normal wear levels on the cams and everything.
I must say, the neons aren't powerful but darn they do keep on trucking.