Up here in Canada we are on the severe maintenance schedule out of the gate and no complimentary maintenance program for us. If you follow the severe maintenance schedule for oil changes it would be 6 months or 5000 miles. The table below details what constitutes severe usage.
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I do my own oil changes and have done so for over 50 years, that way I know what grade and whose oil goes into my vehicles and as well I know what filter is used...granted if the dealership is doing it, then the filters should be the proper ones but as far as oil whose brand is being used, I do not know...the Hyundai Quaker State oil usage I'm sure is a deal with the 2 companies...over the years I've done many things as far as maintenance like shocks and many other suspension items, exhaust, brakes, wheel bearings and many other fixes light starter motors, power steering pumps, fuel filters and one fuel pump, gas tanks and rad replacements both heater and car rads, air filters, wiper blades, light bulbs, power windows and many more...the last time I had to take one of my cars to a garage was about 2 years ago to have the hydraulic clutch cylinders replaced because the car has to be on a hoist and the transmission has to be removed to get at one of them...as far as oil changes I'd say almost all are done time wise, about every 6 months because i don't put on enough mileage.
now I know not everyone can or wants to do the things I do and have to trust the honesty of the dealership or garage you go to...everything on our vehicles have a life expectancy, but these places don't know how you drive and care for your vehicle...as an example things like tires, my 1999 Camaro SS convertible has 60000 kilometers on it...I replaced my original tires in 2011 with Michelin Pilot sport PS2 tires and according to the experts, tires should be replaces every 10 years...now my tires on the Camaro do not have the weight of the car on them for about 5 months of the year because the car is not driven in the winter and the car is on jack stands for that period so that I can run the car for about 5 kilometers once a week because it's on jack stands, that way the wheels and the complete power train is turning thus this keeps all the parts working instead of just sitting for those winter months, and there is no wear on the tires for that period and as well when the car is not driven it is garaged and there is no ultraviolet rays from the sun to rot the tires...now if I took the car to a garage or dealership they would insist on me to replace the tires which would cost me almost 2 grand...my daily drivers tires were always replaced before the tread wear because the sidewalls started cracking from being exposed to the weather 24/7...when you replace tires there's a 99.9999% chance the new tires that go on your car are already at least 1 to 2 years old already and the tire shops will always put on the new tires that have been sitting on their shelves the longest so your 10 years is now much less...this is just an example why I don't go to garages or dealerships unless I really have to...my wiper blades on the Camaro are still the original because how I look after the car and the environment isn't eating away at them and my brakes are still original because I don't beat the hell out of them and I have done a few full bleed of the brake fluid...but of course my daily drivers have had many brake jobs as well as other things because my daily drivers are 20+ years old and are at the mercy of the environment.
The reason for my long winded post is that we owners mostly know when things like oil changes should be done, and time is as important as mileage and if we probably know what condition things like our wiper blades and tires are in for our driving habits...let's face it, the garages don't make their living just doing oil changes and the quick lub places do because they pump oil in your vehicle from a 45 gallon drum of oil that who knows from where and what kind it is, and it's the same for the filters, and they will gladly replace your wiper blades and battery etc. even if you don't need them replaced.
There's one good thing about EV vehicles, there will be less things to be concerned about till the battery life gets to it's retirement age and we'll still have the wiper blade replacement type of things to do and they'll also have required checks.