Honda Civic's Spark Plugs
Hello. My car is an 89' Honda Civic and it now has 90k on her. According to the manual, I should give it new spark plugs now. But I found it difficult to find the right kind of spark plugs for her. For example the manual require a RC9YCN4 if I choose Champion. But all Champion brand plugs I could find in Walmart was marked in 4-digit code. Maybe they use new system of naming lately. Does any one know what kind of spark plugs I should look for?
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