Q: i put 91 super in my car and is says use 87 premium now my battery light is on. what is going on? 2009 Kia Sportage

asked by on

I put 20$ worth of super 91 fuel in my vehicle before i realized it was super. I had a quarter tank of regular 87 gas in it from before. This is what my car calls for. After i realized it i paid for the gas and started my car and now the battery light is on. The owners manual says using plus fuel can really mess up my car and transmission. What did i do to my car?

My car has 170000 miles.
My car has an automatic transmission.

Hello - you did nothing harmful. Your car may have a small level of performance improvement for this tank of fuel, but nothing extraordinary. Long term use of fuel with a higher octane level, MAY lead to increased levels of unburned additives in the exhaust and catalytic converter, but we’re talking about 10s of thousands of miles here for any "damage". The engine simply burns the premium fuel as-is, and doesn’t really use the additional anti-knock additives in the fuel. No harm, no foul. The battery light may be a slipping or broken serpentine belt, a failing alternator, or voltage regulator. I recommend a charging system inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. i put 91 super in my car and is says use 87 premium now my battery light is on. what is going on? 2009 Kia Sportage

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Spark plug threads

It sounds like you may have a stripped spark plug thread in the cylinder head. This can sometimes be fixed by the use of a Heli-coil, which may be a bit difficult to use depending on your experience with them....

Q: Turn signal non stop blinking and has a fast noise.

Hi there. Check the lights and see if there is a bulb that is burned out. A flasher will start to flash quickly when a bulb has burned out causing the power to be transferred to one light only and...

Q: Will not accelarate over 20mph and has a P0430 code

Hello. P0430 is the trouble code for catalyst efficiency below threshold, for bank 2. The computer closely monitors the vehicle's catalytic converter efficiency, and will set off this code if it detects that the converter is not reducing emissions as...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...