There is a Big difference between being dishonest, and pointing out the faults in something you're trying to sell. Selling your house, sure got legal obligations, but you wouldn't say, "Come July, this undersized AC isn't going to keep up". They can clearly look at the tonnage, and do their own thinking, or hire an inspector. I'm not saying hiding roof leaks with paint, But anything you sell, you point out the positive, and gloss over the negative.
When I sold my old Kubota recently, I hid nothing, battery is very weak, seat is rough, wiring a mess, and it starts/runs/hydralics work/gears work, and it could probably use a fluid change. Buyer asked, does the hour meter work? "Yes, and it has the whole time I owned it, but I can't say it always has". He notices and I was honest about new steering box/Pittman arm, new coolant, new water pump. If the radiator had straight water in it; is that something you should point out
Didn't mention the shifter boot leaks water in if left out in open rain. Is that dishonest? It's not concealed that the boot is dry rotted, and for a 1976, what do you expect. Minor fuel drips, minor hydralic drips, I didn't point out either. I dont call that dishonest.
What I consider dishonest is an open lie (it's never leaked a drop of oil), or an attempt to conceal a Known problem (bedliner on truck doors, covering spray foam filled rust holes;
watched uncle in law do that). Removing a hydralic filter "core" to improve flow, knowing the pump is shot, that's dishonest. Rolling back hours/miles, dishonest. Not mentioning teenage son cut the cats of a truck, IDK, but if you cared, why didn't you crawl under there to check?
Is painting your old Yanmar green and yellow dishonest? Heck, is washing engine bay dishonest?
There is a Lot of grey in life; and I never called myself a Saint.
Just keep in mind, before anyone attacks, I'm probably more honest/open, than 75% of people reselling. These are people you will never see or talk too again, why would you feel they owe you honesty?
