wideguy

I browse used bikes sitting at local dealers fairly often. I don't buy many, but I look for signs of amateur/sloppy maintenance. Things like mis-routed wires and cables, nuts, bolts and screws that are mothered up.
If the bike has enough miles, I try to look at the valve cover bolts, trying to see if they look like they've ever been touched by a wrench. I might ask to drop the oil pan and look inside. I don't know how that would go over- I've not actually done that, but I've not bought a high mileage bike either.
How are the valve stem seals on these bikes? Mine are good at around 35,000 miles, intake side anyway. I've not seen talk, so I guess they last?