Given normally that KIA/Hyundai are near or at the top of the tree as regards their warranties, you'd think that they woul have a national database for servicing and repair work.
What I'd be very wary of is how non-franchised garages can prove that they've always used manufacturer's parts or (as allowed) parts of equal quality/performance (as I believe the EU rules state) in order to stay within the bounds of the warranty, as long as the vehicle keeps to its service schedule or better.
Whether they (or any independent for them or other makes) can then input the servicing etc data into the manufacturer's database is another matter - I mean how can it be proven unless such garages are regularly inspected to check? Once last year's/service consumables are removed, no-one can tell what was fitted, only what's in the car now.
Certainly a risk going to a non-franchised garage when you're buying a car with a decent warranty length. As regards service stamps, these can and are increasingly faked, so I'd go for the receipts, but even then they don't often give all the details about the parts and consumables used.
Even some main dealers are now offering aftermarket parts when there are shortages of OEM ones - my Mazda main dealer offered me an alternative clutch (in that case, it was a Bosch) because the Mazda one was on a 3-week back order. My car was out of warranty by quite a few years, but I still went with the OEM part as the cost was only £10 or so cheaper and I knew my existing clutch would last the extra time.
If I bought a new KIA/Hyundai or was in the market for a used one, I'd make damn sure that I got it looked after at a main dealership and that, for the used one, it had a 100% certifiable main dealer history and the warranty was guaranteed by buying it through a main dealer. Not so much for other makes out of warranty if the car was far older, as long as it had a decent quality FSH, with main dealer during its warranty period at the very least.
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