I drive a 07 GMC Sierra 1500 Classic with 271,000 miles… It was running terrible. I put it on a scanner. Mis-Fire #5 cylinder bad fuel injector. Bought a quart of Lucas Fuel System Cleaner… Added to every 15 Gallons of fuel. It took 4 treatments… But now my check engine light is off and truck is running Great… I will recommend this product to all my friends who are looking to get the most out of their vehicles. Thanks for a great Product.

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