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Replace Your Old Spark Plugs with Eco-Friendly Spark Plugs

The Halo spark plug claims to reduce gas mileage by ten percent and toxic fumes by twenty percent. Consult your owner's manual before you replace your spark plugs. Replacing your spark plugs is something that anyone can do, but it is very important to follow the instructions in your owner's manual. Every car is different, and there are hazards that you must be aware of.

Cost: $8.99 per plug.

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