Spark Plugs

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Same price for the plugs in my Civic, but they are good for 110,000 miles.

Edit I should add that my plugs in my Civic now have 197,000 miles on them and the car starts fine and runs good and still gets 38 mpg ave, but I am planning on replacing them at 200,000..just because lol

Again most every fellar has a different POV about plugs and
replacement.In a car,a spark plug could and should last
around 100,ooo miles.My Harley buddy who is a retired
Military Tank mechanic who has a huge tool collection
thinks a motorcycle should change out plugs kinda frequently.
I disagree.Plus he did something I know was not good.I was at
his garage and needed to use one of his spark plug wrenches
to take out a plug that needed cleaning.It was slightly fouled because I had my Fuel Injection module mapped too rich when
I dialed in my new exhaust.When I went to put the plug back in
he insisted I tighten them really good.He had a torque wrench
but wasn't about to run around and look for it.So he tightened the
plug back in really hard.I said ... whoa thar.That isn't good.
Especially when the sleeve for the plug is aluminum.You'll
strip it on too tight.Surely he musta known that.
You don't tighten plugs too tight.Snug them on by hand and then
another quarter turn or so.