What Happens If You Put the Wrong Gas in Your Car?

Idea Forge
Oct 2
2 min read

Filling up your tank might seem simple, but using the wrong type of fuel can lead to serious issues. Whether it's choosing premium instead of regular (or vice versa), or worse—putting diesel in a gas car—using the wrong gas happens more often than you might think. At DM Motorsports in Midland Mint Hill, NC, we often see the aftermath of these common mistakes. Here’s what you need to know.

Premium vs. Regular Gasoline

Many people think using premium fuel will “boost” performance in any car. That’s not true.

If your car requires premium: Using regular may cause knocking, reduced performance, and long-term engine wear.
If your car takes regular: Using premium won’t help and may waste money, but it won’t cause harm.

Bottom line: Use the fuel grade your owner’s manual recommends.

Putting Diesel in a Gasoline Car

This mistake is much more serious and usually requires immediate intervention.

What happens:

Your engine may stall shortly after starting.
Diesel doesn’t ignite in gas engines, so the fuel system can clog.
Damage to fuel injectors, lines, and the fuel pump may occur.

What to do:

Do not start the car.
Call a tow truck.
Have the tank drained by professionals like DM Motorsports in Midland Mint Hill, NC.

Putting Gasoline in a Diesel Car

This is also extremely harmful.

Gasoline reduces diesel’s lubrication, causing friction and damage.
Your vehicle may lose power quickly, and expensive engine damage can result.

Signs You've Used the Wrong Gas

Engine knocking or pinging
Rough idling
Poor acceleration
Warning lights
Difficulty starting

How DM Motorsports in Midland Mint Hill, NC Can Help

If you’ve misfueled, bring your vehicle to DM Motorsports immediately. We’ll assess the damage, flush the system if needed, and make sure everything runs properly.

Avoid costly mistakes—always double-check the fuel grade and nozzle color before filling up. And when in doubt, ask the station attendant or refer to your gas cap.