This magic tool. In short, you save $100 by changing the spark plugs yourself. So please take my advice and spend a few bucks more to get the best tool you can. It turns work from routine to pleasure. Now I wish I could just change my spark plugs every day :). Buy a long extension cord, it only costs $1 more. It took me 1 hour to change the spark plugs in a 6 cylinder BMW from start to finish.
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