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2013 Rio5 EX w/ Convenience & ISG
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293 Posts
The only 'Kia approved' additive I know of you can get over-the-counter is the 12oz Techron you put in the gas tank every oil change. (If you're not using Top Tier gas).
 

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corvette 1992, Kia Rio 2013
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14 Posts
Well I am pretty much "old school" on fuel additives, I use Marvel mystery oil in all my cars, and yet to have any injector problems. Marvel mystery oils is not a solvent, rather a detergent oil.
When I was turning wrenches for as living, I even used it on my air tools to keep them clean, bottom line its good stuff.
 
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