Skip the auto shop - Our mechanics make house calls

Q: I accidentally put premium gasoline in my car

asked by on

Today I went to put gasoline but accidentally I put some premium gasoline, I remove nozzle after 5 sec from car. As far I know some premium got in to car tank. Will it harm my car engine???

Hi there. Premium will not harm your vehicle’s engine. In fact, premium is a required fuel for many of the luxury vehicles today to maintain performance and operation. Premium fuel has a longer burn time which results in fewer deposits left over from the burn; the regular grade has a fast burn time and is known to leave deposits from incomplete burns.

A longer burn time can aid in the prevention of a buildup in what is known in the automotive technology world as a "quench zone". As deposits build up in this zone they actually absorb fuel and additional deposits; if you’ve ever heard an older car continue to run after it’s been shut off this is what causes it to do that. If your car is designed to run on regular, then premium will not cause any problems. However, if your car requires premium, then regular can create drivability symptoms and a possible check engine light. I hope this information helps you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Why would there be gas leaking from underneath the car?

This sounds like potentially a problem related to the fuel tank venting or possibly a leak in the tank itself. This is a difficult problem to diagnose without testing the tank for leaks. Because this can be very dangerous if...

Q: Match powder smell of the engine

It's most likely gasoline. Go buy your gasoline someplace else. It's probably got high sulfur content that has burned and you are going to smell it. Occasionally, some oils also have a high sulfur content, so you might change the...

Q: car won't start

The electronic noise is most likely the fuel pump operating. The gas smell is concerning. A fuel leak could be dangerous and the risk of an engine compartment fire could result if the vehicle operates for any period of time....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...