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???

A: Hi there. Premium will not harm your vehicl...

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: Won't start after hit

It sounds like your fuel pump has failed. This was most likely caused by running out of gas. The fuel is actual what keeps the fuel pump cool. If it overheats, it can burn the contacts out or melt the...

Q: What could be wrong with it

It sounds like you are getting a misfire in one or more cylinders. You should have the engine checked for good ignition spark plugs and wires. You may need to replace the spark plug and wires to see if it...

Q: Battery dies out frequently on 1992 Volvo 740

Hey there, thanks for writing in about your 1992 Volvo 740. I see where you mention the battery tests while the vehicle was running, so I will assume you had the charging system tested and it checked out fine. A...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.