I am just a fellow '97 STS owner...
There's leak and there's burning, but both are pertinent to NS. Some engines might develop some leak, but it's more like seapage or "sweating" at the case half seal, and the reseal is major bucks.
On the other hand most NSs burn oil, and one suspected reason is carbon build-up and stuck rings due to "Little-Old-Lady-Who-Is-Not-From-Pasadena-Type-Driving". A DIY version and an alternative to what FLCaddytech suggests is an occasional WOT in second gear from around 35-40 mph to redline, let it slow down in 2nd, then do it again a few times.
Another explanation is that it's "by design", that is because the NS is a high-performance engine, it has agressive cylinder honing, lots of oil to circulate, therefore some oil loss is expected, ... if you buy that.