Autolite vs AC Delco Spark Plugs

Autolite vs AC Delco Spark plug

If you’re in the market for a new spark plug, two of the most popular brands are Autolite and AC Delco. It’s hard to know which one is better without researching them both. Luckily we did that for you and found out some key differences between these two plugs so that you can make an informed decision about which one is right for your car!

Autolite vs AC Delco Table

We understand how difficult it may be to locate the proper spark plugs. That is why we have provided you with a comparison of two well-known brand spark plugs so that you do not have to do more research. Join us as we travel down the street to learn more about spark plugs.

Spark Plugs Type: Single Iridium

Spark Plugs Type: Single Platinum

Pre Gap Size: 0.040 inch

Pre-Gap Size: 0.044 inch

Exact Replacement for Your Vehicle’s Original Components

Ground Electrode Provides Superior Heat Transfer

Efficient Electrode Designs Provide Reliable Cold Starting & Quick Acceleration

Leak Proof, Heat Fused Resistor for Durability

Suppressor Seal Meters Spark Energy for Long Electrode Life

Fire Quicker With Less Voltage for Easier Starts

Ac Delco Offers a 7 Year/Unlimited Mile Limited Warranty

Comes With 4 Years With Unlimited Mileage Warranty

AC Delco Iridium Spark Plugs Are Backed by General Motors

Provide Service Intervals From 50,000 to 60,000 Miles

Offers Excellent Engine Idle Stability and Smooth Performance

Platinum Center Wire Firing Tip for Improved Performance

Fit Type: Vehicle Specific (Check the Manual)

Fit Type: Vehicle Specific (Check the Manual)

Why Compare?

AC Delco and Autolite spark plugs are the most well-known brands for dependable and long-lasting spark plugs. They’ve been in the business for a long time and are always up against one other. It’s because they share and differ on so many levels. Consider the spark plugs, which perform well while also being dependable.

Although each is made of distinct materials and has unique characteristics, they have certain things in common. For example, AC Delco spark plugs are the best option if you need a long-lasting one for your car. Autolite plugs, on the other hand, are more convenient. But that’s not all; we’ll see additional comparisons between the two later in the piece.

Prevents Gap Erosion

When used properly, spark plugs are intended to generate a spark that will result in a minor explosion and communicate with one another via a slight spike in current. With Autolite, you won’t have to worry about misunderstanding since there will be no gap between you and the person you communicate with. The full platinum-focused tip guarantees that the bridge is completely covered.

AC Delco does not disappoint anybody with its more than 1,000 choices. Furthermore, AC Delco is proudly responsible for the excellent anti-corrosion function of the product. 

These spark plugs are constructed of high-quality materials that prevent them from wearing away quickly over time. The façade prevents filth from adhering to the surface of the building. As a consequence, AC Delco tends to have a longer shelf-life.

Engine Performance 

Spark plugs are among the components that connect the system and maintain the engine operating in a functional state of affairs. They may, however, offer an easy ride via the use of a suitable electrode bridge, saving you a significant amount of money and a significant amount of gasoline.

Consequently, an optimized engine that is more likely to endure a long time is produced.

On the other hand, AC Delco spark plugs are renowned for having poor combustion quality, which is one of its most significant disadvantages. They require relatively little gasoline for emission, resulting in less fuel consumption and less effort from the engine, allowing you to save a significant amount of money over time. As a result, you will get great mileage.

High Technology

Autolite is a precision-engineered product that maintains the gap by using a modified nickel side. Not only with one kind of material but with a mixture of two or more to keep that specific spacing between the two. The ‘tip’ of a spark plug is, without a doubt, the hot-spot of the plug. The exact edge communicates and ignites the spark that causes the spark to leap to the opposite side of the room. 

Considering these considerations, the AC Delco business designs its spark plugs with a particular emphasis on their tips. Both poles are constructed with a laser-welded Platinum center electrode tip for improved arc performance.

Solid Copper Core 

With no exception, Autolite can be relied upon to provide superior performance in any situation. This electrode is well-known for having a solid copper core that allows for a continuous flow of electrodes from one tip to the next.


Despite its eye-catching advantages, AC Delco spark plugs have been noted for having the notorious characteristic of often misfiring. Nonetheless, there have been instances in which AC Delco has failed to fulfill its obligations while undertaking discreet in-between activities.

Platinum is one of the rarest and strongest metals on the planet and can be very expensive. On the other hand, the iridium toner is not much less expensive than the Autolite toner.

Autolite Spark Plugs


  • Tip made entirely of platinum with iridium enhancement
  • There is little or no gap degradation.
  • Steel that has been nickel plated
  • Corrosion resistance that lasts a long time
  • Fuel efficiency has been improved.


  • Things could go a bit quicker than intended.

AC Delco Spark Plugs


  • Increases the rate of acceleration.
  • Enhances the ignition of the fuel
  • Improves cold starting performance
  • It prevents combustion leaks from occurring.
  • Increases the efficiency of the vehicle’s fuel consumption


  • The threaded part is much shorter than the original.

Is The AC Delco A Reliable Spark Plug?

Spark plugs made by AC Delco Professional are high-quality replacements perfect for many automobiles on the road today. This is due to the high melting point and considerable strength of the iridium composition, which also offers outstanding wear resistance and endurance.

What Exactly Do The Numbers On An AC Delco Spark Plug Mean?

The first number indicates the thread size, while the second number indicates the heat range. In the early 1990s, an all-numeric identification code was devised for particular engine applications to guarantee that the right spark plug was chosen when it came time to replace it.

Is It Worthwhile To Invest In Iridium Plugs?

Iridium spark plugs outperform double-platinum plugs in terms of gas economy, performance, dependability, and lifetime, among other factors. Iridium spark plugs are more expensive than copper and platinum alternatives because of the superior material and cutting-edge technologies in their construction.

Is It True That Iridium Spark Plugs Provide Better Gas Mileage?

In addition to increasing your customer’s fuel economy, using an Iridium TT spark plug will help extend the life of their engine. Unlike previous spark plugs, which have a lifespan of around 40,000 kilometers, Iridium TT spark plugs have a lifespan of 120,000 kilometers.


AC Delco spark plugs are a good investment for those who want to improve their car’s performance. However, they do have some drawbacks that should be considered before making a purchase. Overall, though, they are a reliable and high-quality product that can offer many benefits to drivers.

If you’ve made it this far, you should know the differences between Autolite and AC Delco spark plugs. So, hopefully, you can pick between these two options based on their respective characteristics.

Frequently Asked Questions (FAQ)

Yes, ACDelco spark plugs are definitely a good choice! They’re affordable and easy to find, plus they offer great performance. I’ve used them in my own car for years with great results. So if you’re looking for a good spark plug, ACDelco is definitely worth considering.
No, Autolite spark plugs are not made by Ford. They are made by the Autolite company, which is owned by the Bosch Group.
Yes, ACDelco is a good spark plug for your car. They offer quality products that are designed to last long and perform well. Plus, they have a great warranty so you can be confident in their product.



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