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2016 Optima SXL
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135 Posts
Hey gang, so what's the consensus when it'd be beneficial to replace spark plugs? And those who have changed them early, did you notice any benefits in smoothness, performance, and/or fuel economy? My SX-L is sitting at almost 26K miles.
 

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2011 Kia Optima
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2,780 Posts
You'll not see any improvement when replacing spark plugs, unless one is not firing.
Turbo cars @ 45k miles, N/A 100k miles.
 

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Your K5 Optima Vendor
2020 Audi R8 V10+ & Tesla Model X P100D
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28,952 Posts
Hey gang, so what's the consensus when it'd be beneficial to replace spark plugs? And those who have changed them early, did you notice any benefits in smoothness, performance, and/or fuel economy? My SX-L is sitting at almost 26K miles.
It is beneficial to replace them at approximately 45,000-50,000 miles, or if you are installing a performance tune, or noticing sluggish performance with the existing ones.

Many time customers will report noticing a difference when upgrading to a better performing spark plug from the stock plugs, especially if you have installed a tune on the vehicle.

Feel free to read some of the 170 reviews on our website from verified buyers who have purchased the product to get a better idea for yourself.

HKS M45XL Spark Plugs - K5 Optima Store
 
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