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I always buy the NGK plugs, the last digits... 4F-11 and 5F-11 the 4 and 5 are the heat range, the lower the number the hotter the plug, I tend to drive short trips and don't have any issue with the #4 heat range, my plugs tend to look pretty clean without any odd coloring on them when I change them.
I also tend to buy my spark plugs at the auto part store and I seem to remember them being about $1.80 each last time I bought some, NGK copper core V-Power.
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