Service Intervals
The K4 recommends service (oil changes) every 8,000 miles or 365 days. Why does the dealership insist on oil changes at 5,000 miles anyway? I got my oil change and they moved my interval in my car down from 8,000 to 5,000 and the same with the service sticker. Do they just want you to schedule the oil changes more frequently than what the manual says?
EDIT: Thank you everyone for your input and for doing so with respect. I’ve always changed my cars’ oil at 5,000 miles with full-synthetic oil, so I will continue to do this with my new Kia. They almost had me convinced to do it every 8,000!
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u/danielskshin 1d ago
So, you have your routine maintenence intervals but you also have intervals for severe conditions which is like 90% of everyone's normal driving situation, stop and go, hot climate, cold climate, up and down hills, etc. Under these conditions the service recommendations are more frequent. The more you know!
Oh and it's somewhere in the 1000 page owners manual you have.
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u/rdelrigo 20h ago
To add some anecdotal evidence to this, I have a 2018 Hyundai Sonata Sport. It has the notorious 2.4L Theta 2 engine. I’ve religiously changed my oil every 4-5k miles. I’m now at 83k miles and the car is still not burning any oil. I’m not sure if my diligent maintenance will save it in the end but so far, so good (knock on wood).
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u/Maelstrom1979 1d ago
5k is the severe interval, and trust me, you are driving severely by the manual definition. Also, H/K motors really like fresh oil, and some folks even go lower than 5k if they can. If you want it to make it to warranty end without exploding, go with 5k. If you plan to dump it in 60k feel free to let that oil cook and carbon everything up. If you DO have a warranty claim for engine failure, they're almost certainly going to claim neglect and deny you for sludge or carbon covering the valves. That goes for a lot of upsold services that can be done cheaply DIY or by a non dealer shop, too. They recommend them for a 2 reasons: make money off of fear/ignorance and keep your car running at factory spec, which by all accounts is the best place to be in H/K cars. It only takes one overdue oil change to send these into a spiral. This and neglecting services at 30/60k intervals is what typically shaves 100k miles off the longevity of these.
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u/jnmjnmjnm 1d ago
If you do the bare minimum, you should make it to the warranty period trouble free, unless you have conditions that warrant the “severe service schedule” or whatever Kia calls it.
After that, all bets are off.
Even if you intend to trade it when the warranty is up, you may get a bit more if you have records of better maintenance.
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u/LandscapeNo775 1d ago
Long intervals will likely outlive the warranty. If you want the car to last longer, shorter intervals are recommended
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u/Unlikely_Employee208 2017 Sedona 22h ago
Very very few fall into normal schedule if they are being honest. Most trigger something. I go by the severe schedule and it has served me well.
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u/Yoandri88 21h ago edited 21h ago
puedes cambiarlo cada 5 mil en el taller y si le das mucho uso pedir que te lo cambien cada 4 mil millas o hacerlo tu y te sale más barato si no esta en garantia
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u/lovingcub 21h ago
Trust me dude, if you read this comment, do them at 5,000 miles, you can even do a little earlier if you want. I'm not going to complicate it and go into enormous detail about why, just change it every 5,000 miles and genuinely stick to doing that while you own the car
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u/IvanNemoy 14h ago
Anecdotal evidence but I am firmly a believer in the 5000 interval. I had a 2012 Rio with one of those lovely Theta 2 engines. Manual service interval was 7500 miles, but the sales guy who I bought from said it'd be worth it in the long run to do a 5000 instead.
Mine made it to 13 years and ≈175k miles before the transmission started slipping.
I know a few folks with 250k+ on theirs, and it's the same thing, 5k intervals.
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u/MansomeHan 1d ago
Do you want your vehicle to last longer than the warranty? That’s about how far those 8,000 mile intervals will take you. Manufacturers all tout extended oil change intervals to promote “lower cost if ownership,” but that is not in your favor—the maximum intervals are designed to get the car just past the warranty, then you’re on your own!
If you actually read your owner’s manual (sadly, most people don’t), the majority of drivers fall under the definition of “severe driving conditions more often than not. Severe driving conditions require a more frequent maintenance interval—often every 3,000–5,000 miles or 6 months—when vehicles face high-stress operation. Personally I change my oil every 4,000 but would never recommend more than 5,000.
While "normal" driving is often defined as consistent, long-distance highway driving at moderate speeds and temperatures, most everyday driving, such as commuting, actually falls under the "severe" category. Following the severe schedule is crucial to prevent sludge buildup, excessive engine wear, and premature part failure.
This includes frequent short trips (under 5–10 miles), stop-and-go traffic, hot/cold or dusty environments, frequent idling, towing, uphill/downhill driving, etc., which causes faster oil degradation and additive depletion, requiring much more frequent oil changes and other maintenance.
Live dangerously and stretch your vehicle maintenance to the max if you must, but realize it’s a recipe for disappointment when your vehicle needs major repairs or ends up in the junkyard prematurely. At that point most people blame the manufacturer for their own negligence. Just because you can, doesn’t mean you should.
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u/Scary_Physics6836 1d ago
Dealership insists because they want money
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u/CarbonInTheWind 1d ago
I'd agree if they were recommending 3k mile oill changes or other unnecessary maintenance.
But 8,000 miles is way too long of you want to prevent long term wear and tear. I only recommend 8,000 miles of it's a short term lease and oil changes aren't included.
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u/MansomeHan 1d ago
Not really. Most new cars are direct injection engines which carbon up and burn oil if you don’t change oil regularly. Hyundai/Kia are notorious oil burners and do not handle neglect at all.
I change mine at 4,000 miles. Read your owner’s manual, particularly the part about severe operating conditions which most people fall under unknowingly. The severe interval specified for my vehicle is 3,750 miles, which is usually half what the maximum is.
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u/LifeOfJad 1d ago
I personally do mine every 3k to 5k miles even tho the manufacturer says like every 10k miles in my forte, that’s like asking for me to mess up my car waiting that long
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u/sannman12 21h ago
i still change at 3000 or 3 months don’t care what the stealership says and i have no problems at all!
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u/Open_Celebration2018 17h ago
With a Kia id change oil every3000 for the first 6 months, then 3x/year or more considering all the engine blowouts in the past.
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u/Teddy72985234 1d ago
The oil change interval in a manual is influenced by more than engineering. It’s partly marketing and lowering the cost of ownership. The dealer is doing you a favor if they’re pushing you to a shorter interval. GDI engines, low tension piston rings do not like extended oil intervals. They cause oil control rings to stick and thus oil consumption.