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I'm not going to argue here, @Sensibly Sprited Driver. The Kia manual says top tier fuels and 87 octane or better. I don't disagree that the 3.3T will likely run better on 91 octane than 87 octane, but I challenge your claim that "using anything under 91 will shorten the life of the coils and adversely impact the engine due to incomplete combustion." Lower octane fuel actually burns faster than higher octane which is why it is prone to pre-ignition, and it contains smaller chain hydrocarbons which leave less residue, not more. (I'm a retired chemist, so if you challenge that, I will demand supporting literature from recognized sources.)
You should get better performance from 93 with this engine as it does have knock sensors in it. It will increase the timing until it recognizes pre ignition, so it can advance the timing more with higher octane.


thats 7.29 quarts for the 3.3Kia Stinger Standard Oils
3.3 V6 - 5W-30, 5W-40 or above
3.3 V6- ACEA A5 or above
2.0 - 0W-30, 5W-30, 5W-40 or above
2.0 - ACEA C2 or above
3.3 Twin Turbo Oil Volume
7.92 US quarts
2.0 Sing Turbo Oil Volume
6.02 US qtuarts
thats 7.29 quarts for the 3.3