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Discussion Starter · #1 · (Edited)
Fun facts. I just read the entire manual cover to cover (yes I am that guy) and wanted to point out a few things most people probably wouldn't know had they not seen this.
The manual states that the carnival should only use gas rated 91 octane or higher. (And use an approved additive every 8k miles if you have a warranty that requires proof of service records)
Only use full synthetic 0w-20 oil and it's recommend every 8,000-10,000 miles.
Do not traditional tow ever, only 4 wheel flat or on dollies.
The book says you really shouldn't tow a trailer, but if you must tow don't do more than about 1,000lbs without trailer breaks, and don't go over 60mph.
The roof rack can only support 220lbs, while the total vehicle can only support 1,323lbs total including occupants and cargo.
 

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Yep, my manual is the same now that you mention it. I suppose it's better to just go with 91 octane?
I told my significant other that we should probably put super in it once and a while just to clean things out. Otherwise putting 87 with a fuel additive like Costco sells would be fine for most of the time. Most engines are tuned to work with a wide range in quality of fuel. Your engine may suffer in fuel economy and power or worse, it could clog the fuel injectors if you constantly put poor quality fuel in it but fuel from a reputable place with an additive in it should be fine for the majority of time. If it were turbo charged, I would be more concerned. I guess we’ll see if there is more clarity from Kia at some point in the future.
 

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Does 91 octane have special additives to clean engine parts? They all have additives. Like you alluded to w/ the turbo, the 91 octane is mainly for high performance engines to prevent knock, and I don't think the Carnival engines need this at all, unless the 87 octane verbiage is an error.
 

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I read the manual before buying the car and noticed the conflicting info. I asked multiple people at the dealership what gas to use and they all said regular 87 and that's what they put in when you get the car from them.
 

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2022 Kia Carnival SX
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High octane gas doesn't combust as easily under pressure as 87. It's used in high performance cars because they typically have higher compression ratios. Essentially, a high performance engine will want to highly compress the air/fuel mixture before igniting it. That makes the explosion more powerful and gives these engines those extra horses you paid for.

That is absolutely not the case with our V6. 87 is optimal and anything higher will simply be a waste of money and could actually hurt the engine's performance as the computer will have to compensate for using the wrong gas.
 
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