Q: Do I really need to use high octane fuel or can I use mid grade (occasionally)?

asked by on

is it necessary to use the higher octane gas. i sometimes use mid grade and I don't hear a knock or ping. with the price of gas saving a few dollars at fill-up seems like it worth it

My car has 6600 miles.
My car has an automatic transmission.

If your vehicle is required to use high octane fuel, then using anything else can cause damage to the pistons and valves in the engine. When you say you cannot hear any pinging when you are using mid grade fuels then you need to be sure since not all pinging can be heard by the human ear. The pinging may be happening so light that you would not be able to hear it. Any pinging is not good to the engine and can burn holes in the tops of your piston. Pinging is the fuel is igniting before the engine wants it to and ignites before the ignition sparks it. This is why it is called pre-ignition. I recommend not using any mid or low octane fuels for this vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Do I really need to use high octane fuel or can I use mid grade (occasionally)?

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: So a friend and I spent 2 days putting a brand new generator in the Beetle, but it went bad this morning. Why.?

Hi, thanks for writing in. I'd be happy to provide some insight. There are a few issues that may be happening. First, the voltage regulator for the generator may be bad and caused over or under charge conditions. Or, the...

Q: I have a 2003 Volkswagen Passat. It makes a hard knocking noise when I break. What could it be?

Your friend could be right. If you hear a single knock each time you hit the brake pedal, that could be rear control arm bushings shifting. It could also be motor mounts. If you are hearing a knocking that repeats...

Q: He

Hi there: The problem with the question you're asking is that we don't have enough data about the different performance adders you've upgraded for drifting application. The problem with consistent spinning of drive wheels is that it creates incredible friction...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...