"cruiser owners are generally decent humans who aren't looking to fu@k others over."
IMHO it might be more accurate to say: "MUD forum Land cruiser owners are honest ----"
I've run into every type when looking for 80's to buy over the years, people lying through their teeth with the evidence right in front of them.
Examples:
Extremely loud engine knock (think 3lb hammer striking the block) "mechanic said it was fine---"
Oil flowing out in a two foot puddle on the ground "it doesn't have any leaks"
Engine with no power "I'd drive it to Alaska tomorrow---" (cracked cylinder wall, engine block full of head gasket sealer).
Another engine with no power, "it might need a tune up" Found a new aftermarket radiator, signs of head gasket sealer dumped in, milky engine oil/water and HG sealer still in the radiator overflow tank. When pointed out the crud in the tank the seller mumbled to himself "Oh, I forgot to clean that out", and then dumped it on the ground with no other explanation.
"No problems at all". Take the vehicle for a drive, rear axle noises and gear oil all over from a leaking rear pinion seal (wobbly pinion gear), ask the seller about it and she starts crying "the mechanic told me it needed ----"
Got more examples but the post would be too long: people with a straight face (except for the crying lady) knowingly lied about the condition of their vehicle for sale.
Agree, oil leaks are common, not the point. Head gasket leaks are not all that common but a possibility (with any engine), so a buyer needs to check for signs of previous attempts to seal the HG by dumping in a sealer then dumping (selling) the vehicle.
So the point is: take the sellers words with a large grain of salt, check it out yourself or get a local MUD member to go with you, or take it to a Dealer
just to make sure nothing major is going on with the vehicle. Just simple prudence for any used vehicle.
Having said all that, don't hesitate, it could be a great vehicle. I would buy it
at 15k if there were no red flags.