I thought it was a waste of money. Long story short, I didn't get any oil anywhere because this thing works the way it's supposed to work. I doubted when I saw it. I didn't think all the old oil would stay in the filter, I thought something would leak. No drop. So, in my humble opinion, if you change the oil yourself, don't want to have it everywhere and everywhere, and don't mind spending about $10 to keep it that way, this spark plug is for you. It's worth the money I spent keeping it all to myself.
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