I mean it's 4yrs old.. If you've done everything WRONG, you shouldn't need to perform that depth of clean...
You would be better off putting it in the tank as above, or just using it on something else and throwing a bottle of Cheveron Techtron in and calling it a week..
I'm curious, why do you feel you need this to begin with? is the car acting funny? gas mileage down?
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