Q: Using E-15 fuel in my car do I need to use regular unleaded fuel maybe once in awhile or is it safe to continue to use the E-15?

asked by on

Can I use E-15 fuel on every fill up or should I use regular once in awhile

My car has 93000 miles.
My car has an automatic transmission.

E-15 is shorthand for gasoline blended with 15% Ethanol which is a fairly corrosive material which can cause damage to rubber parts and other critical parts over time. Ethanol also attracts and bonds with water from the air, and that water can separate out inside the tank due to phase separation. If your vehicle sits for long periods between use, the moisture settles to the bottom of the tank and can potentially clog in-tank pumps and filters. Damage is also possible in fuel lines, injectors, seals, gaskets, and valve seats as well as carburetors on older engines.

The main issue with respect to E-15 in many cases is whether or not the car will be covered under warranty from damage caused by using this product. GM and Ford have certified their own cars starting with 2012 (GM) and 2013 (Ford) to be compatible with E-15 and so some of the newer cars may not have any trouble with this.

I would not recommend using this fuel on longer drives where the chances of burning through an entire tank relatively quickly are greater. This may lessen the chance of excess E-15 fuel sitting in the bottom of your tank for longer periods of time where it may be prone to causing damage as outlined above.

If you run into any issues, feel free to contact YourMechanic, as one of our mobile technicians can come to your home or office to service your vehicle.

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. Using E-15 fuel in my car do I need to use regular unleaded fuel maybe once in awhile or is it safe to continue to use the E-15?

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: Car does not start.

If the engine dies while driving and it is associated with an electrical service light, the issue is almost certainly the alternator. I would recommend having your starting system inspected for faults by a technician from YourMechanic. If the alternator...

Q: Low Fuel Light on with fuel in tank

The fuel level sensors on some of these vehicles tend to be misread by the computer, causing faults in the system. The fuel sensor would need to be inspected, and the engine computer scanned, to see if the codes received...

Q: Engine light on, black smoke coming out exhaust on acceleration and fault codes

The glow plug faults are most likely going to cause a hard start condition, which will be most noticeable when the engine is cold. The colder the engine, the more difficult it would be to start usually. Often times, glow...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...