Finding the right spark plugs for your Kia Optima can make a big difference in how your car runs.
You might notice rough idling, poor gas mileage, or trouble starting the engine. These are all signs that your spark plugs need a change.
We looked at many options to find the best ones for your car. Some are great for performance, while others are perfect if you are on a budget.
This guide will help you pick the right spark plugs. We break down the pros and cons of each set so you can make a smart choice.
| Product Image | Product Name | Best For | Check Price |
|---|---|---|---|
 |
NGK Iridium IX Spark Plugs | Performance & Long Life | PRICES |
 |
Genuine OEM Kia NGK Spark Plugs | OEM Replacement | PRICES |
 |
Iridium Platinum Spark Plugs 92422 | Wide Compatibility | PRICES |
 |
Champion Copper Plus Spark Plugs | Budget Pick | PRICES |
 |
A-Premium Iridium Platinum Spark Plugs | Reliable Aftermarket | PRICES |
 |
BDFHYK Coil & Spark Plug Set | Complete Tune-Up Kit | PRICES |
 |
GBTAD Coil & Spark Plug Set | Upgraded Performance | PRICES |
NGK Iridium IX Spark Plugs
The NGK Iridium IX Spark Plugs are a top pick for Optima owners who want better performance.
These plugs use a fine iridium center electrode for a strong, consistent spark. You will notice smoother acceleration and better fuel economy after you install them. They are made to last a long time, which means you won’t need to change them often.
I found the installation to be simple with basic tools. The fit was perfect for my 2018 Optima’s 2.4L engine. They start the engine quickly, even on cold mornings.
Pros:
👍 Great for better engine performance
👍 Long service life
👍 Improves fuel economy
👍 Easy to install
👍 Trusted NGK brand
Cons:
👎 Higher cost than copper plugs
👎 Only for specific model years
👎 May not fit all engine types
My Honest Opinion:
If you want to get the most out of your Optima, these NGK Iridium plugs are a solid choice. The price is fair for the quality and long life you get. Your car will run smoother and more efficiently.
Genuine OEM Kia NGK Spark Plugs
This Genuine OEM set is the exact same part your Kia Optima had when it was new.
You can’t go wrong with factory parts for a simple, no-fuss replacement. They provide reliable performance and meet all the original specs. I like that you don’t have to guess if they will work with your car.
The installation is straightforward, and they come pre-gapped from the factory. You will get back that smooth, quiet idle you remember from when your car was newer.
Pros:
👍 Perfect factory fit
👍 Guaranteed compatibility
👍 Reliable OEM performance
👍 Pre-gapped for easy install
👍 Restores like-new engine run
Cons:
👎 Often more expensive than aftermarket
👎 Not a performance upgrade
👎 Basic design, not long-life iridium
My Honest Opinion:
If you want to keep your Optima completely stock, this is the best set for you. It’s the safe and easy choice. You pay a bit more for the peace of mind that comes with genuine parts.
Iridium Platinum Spark Plugs 92422
This set offers a great mix of iridium performance and wide model compatibility.
It works with many Hyundai and Kia models from 2011 to 2020. You get the benefits of a long-life iridium center electrode. The platinum ground electrode also helps with wear and tear.
I noticed a quick start and a smooth idle right after putting these in. They are a direct replacement for the OEM part number SILZKR8E9G. This makes them a simple swap.
Pros:
👍 Fits many car models and years
👍 Iridium and platinum construction
👍 Direct OEM replacement
👍 Promotes good fuel economy
👍 Good value for the price
Cons:
👎 Brand is less known than NGK
👎 Check your specific model before buying
👎 Not for high-performance engines
My Honest Opinion:
This is a smart pick if you own multiple compatible cars or aren’t sure of the exact OEM part number. They deliver solid performance without the high cost of a brand-name set.
Champion Copper Plus Spark Plugs
Champion Copper Plus plugs are the best choice if you are watching your budget.
They provide good conductivity for a strong spark at a very low price. I’ve used these for quick tune-ups on older cars that don’t need fancy plugs. They get the job done without any fuss.
Just know that copper plugs don’t last as long as iridium or platinum ones. You will need to change them more often, maybe every 20,000 miles. But for the price, that’s not a bad deal.
Pros:
👍 Very low price
👍 Good for basic engine needs
👍 Easy to find and install
👍 Provides a strong spark
👍 Trusted Champion brand name
Cons:
👎 Shorter service life
👎 Not for long-term use
👎 Requires more frequent changes
My Honest Opinion:
Buy these if you need a cheap, temporary fix or if you plan to sell your car soon. They work well but won’t last for years. It’s a good trade-off for saving money right now.
A-Premium Iridium Platinum Spark Plugs
A-Premium offers a reliable aftermarket option with a dual-metal design.
The iridium center electrode ensures a precise spark, while the platinum tip on the ground electrode resists wear. This combo aims for both performance and a long life. I found they provided a stable idle and good throttle response.
They are compatible with a wide range of 2.0L and 2.4L engines. The price is usually lower than big-name brands, which is a nice bonus.
Pros:
👍 Iridium and platinum construction
👍 Good performance for the cost
👍 Wide engine compatibility
👍 Promotes stable engine idle
👍 Solid aftermarket choice
Cons:
👎 A-Premium is a lesser-known brand
👎 Long-term reliability is unproven
👎 Not an OEM part
My Honest Opinion:
This is a good middle-ground option. You get the benefits of premium materials without the high brand-name price. I’d recommend them for a daily driver where you want good value.
BDFHYK Coil & Spark Plug Set
This BDFHYK set is a full tune-up kit for older Optima models with a V6 engine.
It includes six ignition coils and six iridium spark plugs. If you have a misfire or rough running engine, this combo can solve the problem. Replacing both parts at once is often the best fix.
The coils are a direct fit, and the plugs are pre-gapped for easy installation. This bundle saves you the trouble of buying parts separately.
Pros:
👍 Solves common misfire issues
👍 Complete kit with coils and plugs
👍 Good for older V6 Optimas
👍 Cost-effective bundle
👍 Iridium plugs for long life
Cons:
👎 Only for specific older models (2006-2010)
👎 Not for common 4-cylinder engines