Our '97 w/10k Onan diesel had 99 hours on it when we bought it last fall. It runs and performs perfectly. I think, if you run into something similar, it's cause for further investigation, not condemnation!
If maintenance logs show proper maintenance has been performed (even with no usage the oil should still be changed annually!), and a performance check reveals no issues, you're good to go! Is it normal, heck no. Am I going to turn my heels and walk the other way for this reason? NO WAY! Not without checking into it further...
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake