I was in a pinch the other day, and bought some for my backpack blower. If advance auto parts was closer than home depot, and I wasn't running out of sunlight, I would have replaced the NGK with another NGK. I'm partial to them. I think they were almost $6 for the e3. And come to find out, the carb just needed cleaned. So, I put the 11 year old NGK back in it. Runs like a top.