, and you're not ruining a super well preserved STS.
Let's not get crazy here...it's a 90s GM, nothing more. There's nothing remotely special about this car and the mileage is already well beyond the rare "time capsule" status and firmly into "driver" status. Would you think the same if this was a similar vintage Avalon or Accord or Lincoln Continental?
The only thing someone would risk ruining if they bought this car is their credibility by thinking it's special enough to warrant continued "preservation".
LOL
Oddly enough, someone reached out to me recently when they found a 1 owner, 1995 Lexus LS400 with similar mileage. At no point did the thought of "preserve" or "ruin" ever cross my mind. But rather "you'd have a nice car to drive for the next 400k without spending a ton of dough to buy".
I feel the same about this Cadillac. Buy it, drive it, enjoy it. You have a pretty nice car that you didn't drop a ton of coin on. The only crime here would be NOT racking up mileage on this car and just enjoying it.