New to forum & had basic question. Had bikes for years, have HD Forty-eight that I love as a bar hopper. Am considering a Street Glide for road trips. Was told by long time HD guy that typically you can get XX,XXX miles on a HD before you need serious engine work. I see lots of bikes for sale with 25,000-30,000 miles & was wondering if those sales are because of anticipated engine problems? As a general rule, with a well maintained HD...how many miles is a good average before you need to put serious $$$ into engine repairs? I know there are exceptions...but, what can I anticapate? Thanks guys/gals.