Mystery oily oozing near wheel need advice

You could also check the small cap on the vent at the center of the shaft. if it is stuck and clogged from dirt and rust the oil when heated from normal driving will press out the seal.
On the pictures your car looks fairly clean and not so rusted but it is worth a check.
the wheel will not fall off from lack of oil or worn bearings for years I would guess, but when it does the car is most likely dead. I would fix the seal and bearings and your car will last for ages.

And use oil/grease rather than WD40 for lubing stuff..

The WD40 can be used to loosen stuff like your vent cap on the shaft if stuck.

Thanks for your insights! Invaluable! I drive only short trips on mostly paved roads, but the leak in the front right started after I hit a bad pothole pretty hard! I never drive more than a few miles a day and at a max speed of maybe 50 or 60 kmh (31-37 MPH). I think I found the parts online to do a kingpin bearing replacement (kit), but I worry that on my small island the mechanics will screw it up so bad that I would have been better off just topping up the differential oil from time to time. The car was used (direct from Japan via roll-on-roll-off ship) when I bought it and shipped it to the island. It's a 2003 Jimny which I obtained in 2016, so now its 21 years old(!). I'm just hoping to 'nurse it along' for my short somewhat slow trips. I do sometimes carry some heavy loads (scuba gear!) and maybe that will cause issues also? I guess I could order the kingpin bearing replacement kit and have it ready just in case???

It's a 2003 Jimny that I obtained used from Japan in 2016. The automatic transmission has been rather jerky from the start...which is probably why the owner in Japan sold it (sold for $3,000 US in 2016). I watch a car guy on youtube who said be careful about replacing the transmission fluid or maybe even the oil if the car is rather old...as the friction from the fluids might be the only thing keep the thing going? Or maybe that was only the transmission fluid. I ordered an oil filter from Suzuki Japan but am afraid to try to change the oil in case the oil drain plug breaks or leaks after the change...and then I have no way to fix that. I drive it only about 4,000KM/year so it is lightly used, but is vital! Guess I'd better order an oil drain plug?

The owner of this site Martin sells the kingpin bearing kits including oil seals but not sure if he can ship to Bonaire or how much shipping would be, have a look in the BigJimny shop in the banner at the top and send him a message.

Martin has also made a video and there is a step by step guide on replacing the kingpins and many other tasks, it is quite straight forward and anyone who has a garage there could do the job. It’s no harder than replacing a wheel bearing, I should know I did both on my Gen3.

If your mechanic got stuck you could always ask for help on the forum, no matter where you buy your parts from.

Robin

You shouldn't be worried about changing the engine oil, it's an easy routine job and important for the health of your engine.

Changing the transmission oil is more complicated and best done by a garage with experience, but again, it's a routine procedure that shouldn't be ignored.

It's a 20 year old Japanese car. It's engineered to be practical, reliable and robust. It's not a delicate european classic car that will fall apart if you look at it wrong. You don't need to fear working on it!